Best Dark Spot Correctors of 2026: 15 Products Ranked by Ingredients and Results

The best dark spot corrector in 2026 is one that pairs proven brightening actives (niacinamide, alpha arbutin, vitamin C, or tranexamic acid) with a formula gentle enough for daily use. After comparing 15 top-selling serums by their ingredient lists, clinical backing, and real user feedback, I narrowed the field to picks for every budget and skin type. My top overall choice is the SANE MD Dark Spot Corrector for its multi-pathway formula, but several others on this list deserve serious attention depending on your skin concerns and price range.

Below, you’ll find a quick comparison table, individual reviews with pros and cons for each product, and an ingredient science breakdown so you can make your own informed decision. I also explain the ranking methodology and answer the questions I hear most from patients about dark spot treatments.

Quick Comparison: 15 Best Dark Spot Correctors at a Glance

Product	Key Active Ingredient(s)	Price Range	Best For
SANE MD Dark Spot Corrector	Niacinamide, Alpha Arbutin, Oligopeptide-68	$$	Overall best (multi-pathway formula)
La Roche-Posay Mela B3 Serum	Melasyl, 10% Niacinamide	$$	Sensitive skin, melasma
Paula’s Choice Discoloration Repair	Tranexamic Acid, Bakuchiol, Niacinamide	$$	Retinol-sensitive skin
SkinMedica Even & Correct Advanced	Tranexamic Acid, Phenylethyl Resorcinol, Niacinamide	$$$$	Stubborn hyperpigmentation
Murad Rapid Dark Spot Correcting Serum	Resorcinol, Glycolic Acid, Tranexamic Acid	$$$	Fast visible results
Live Tinted SUPERHUE Serum	Tranexamic Acid, Niacinamide, Kojic Acid	$$	Melanin-rich skin tones
Clinique Even Better Clinical Radical Dark Spot Corrector	Vitamin C (Ascorbyl Glucoside), Yeast Extract	$$$	Whole-face brightening
Dermalogica Powerbright Dark Spot Serum	Hexylresorcinol, Niacinamide, Vitamin C	$$$	Post-inflammatory hyperpigmentation
TruSkin Vitamin C Serum	Vitamin C (L-Ascorbic Acid), Vitamin E, Hyaluronic Acid	$	Budget pick
Mad Hippie Vitamin C Serum	Sodium Ascorbyl Phosphate (SAP), Ferulic Acid	$$	Sensitive skin, vitamin C beginners
AXIS-Y Dark Spot Correcting Glow Serum	5% Niacinamide, Rice Bran Extract	$	K-beauty fans, lightweight formula
Tatcha The Dewy Serum	Lactic Acid, Hyaluronic Acid, Japanese Purple Rice	$$$$	Dry skin, glow + hydration

Price key: $ = under $25 | $$ = $25-$50 | $$$ = $50-$80 | $$$$ = $80+

Individual Product Reviews

1. SANE MD Dark Spot Corrector (Top Overall Pick)

This is the product I recommend most often because it targets melanin overproduction through multiple pathways at once. The formula combines niacinamide (which limits melanosome transfer to skin cells), alpha arbutin (which slows tyrosinase, the enzyme that triggers melanin production), and Oligopeptide-68 (a newer peptide that interrupts pigment signaling at the cellular level). That three-pronged approach matters because dark spots rarely have a single cause.

The texture is lightweight enough to layer under sunscreen without pilling, and the formula skips hydroquinone entirely. I’ve watched patients with sun-induced dark spots on their face see meaningful fading within 6 to 8 weeks of consistent use.

Pros:

• Multi-active formula targets three steps in the melanin pathway
• No hydroquinone, no prescription needed
• Layers well under SPF and makeup
• Suitable for all skin tones

Cons:

• Only available online (not in drugstores)
• Results take 6-8 weeks of daily use

Shop SANE MD Dark Spot Corrector

2. La Roche-Posay Mela B3 Serum

La Roche-Posay’s entry here uses Melasyl, a proprietary molecule the company developed specifically to trap and neutralize melanin before it reaches the skin surface. Paired with 10% niacinamide, this serum addresses both new spot formation and existing discoloration. The high niacinamide concentration also supports the skin barrier, which makes it a solid option for people whose skin reacts poorly to vitamin C or retinol.

The downside? Melasyl is brand-new and long-term data beyond L’Oreal’s own trials is limited. Still, the early research looks promising, and niacinamide at 10% has plenty of independent support behind it.

Pros:

• Melasyl is a novel approach to melanin interruption
• 10% niacinamide is well-tolerated by most skin types
• Fragrance-free, good for sensitive and reactive skin
• Available at most drugstores

Cons:

• Melasyl lacks long-term independent research
• Premium drugstore pricing

3. Paula’s Choice Discoloration Repair

Paula’s Choice built this serum around tranexamic acid and bakuchiol, a plant-based retinol alternative. Tranexamic acid works differently from most brightening ingredients. Instead of targeting tyrosinase directly, it blocks plasmin activity in skin cells, which reduces the inflammation loop that triggers excess melanin. Bakuchiol gives you retinol-like cell turnover benefits without the dryness and peeling that retinol causes for many people.

This is my go-to suggestion for anyone who has tried retinol for dark spots and found it too irritating.

Pros:

• Tranexamic acid targets inflammation-driven pigmentation
• Bakuchiol provides gentler alternative to retinol
• Works well alongside other actives in a routine
• No fragrance, no irritating alcohols

Cons:

• Results can be slower than vitamin C or hydroquinone serums
• Smaller bottle size for the price compared to some competitors

4. SkinMedica Even & Correct Advanced

SkinMedica’s formula is one of the more expensive options on this list, and the ingredient deck explains why. It layers tranexamic acid with phenylethyl resorcinol (a tyrosinase inhibitor about 22 times stronger than kojic acid in some in-vitro studies) and niacinamide. The clinical data from SkinMedica’s own trials showed visible spot reduction in as little as 2 weeks, though individual results vary widely.

If you’ve worked through drugstore options without results and want something closer to what you’d get from a prescription-strength treatment without actually needing a prescription, this is worth the investment.

Pros:

• Phenylethyl resorcinol is among the strongest OTC tyrosinase inhibitors
• Backed by brand-sponsored clinical trials
• Multi-pathway formula similar in approach to prescription options

Cons:

• High price point ($150+)
• Available mainly through medical spas and select retailers
• Clinical data is manufacturer-funded

5. Murad Rapid Dark Spot Correcting Serum

Murad leans on resorcinol and glycolic acid alongside tranexamic acid. Glycolic acid is an alpha-hydroxy acid (AHA) that physically exfoliates pigmented surface cells, which is why this serum tends to show visible changes faster than options that only target melanin production. The trade-off is that glycolic acid increases sun sensitivity, so strict daily SPF is non-negotiable with this one.

People with oily or thicker skin tend to tolerate this formula best. If your skin is dry or easily irritated, the Paula’s Choice or La Roche-Posay options above will likely suit you better.

Pros:

• Glycolic acid speeds visible results through exfoliation
• Tranexamic acid adds melanin-pathway targeting
• Good for oily and combination skin types

Cons:

• Increases sun sensitivity significantly
• Can cause dryness and peeling in the first 2 weeks
• Not ideal for sensitive or dry skin

6. Live Tinted SUPERHUE Serum

Live Tinted built its brand around serving melanin-rich skin tones, and SUPERHUE reflects that focus. The formula combines tranexamic acid, niacinamide, and kojic acid. Kojic acid (derived from fungi) inhibits tyrosinase, and research suggests it works particularly well on post-inflammatory hyperpigmentation (PIH), the dark marks left behind by acne or irritation.

The brand was founded by Deepica Mutyala specifically to address hyperpigmentation in deeper skin tones, which is a population that hydroquinone and some retinol products can actually make worse through rebound darkening. This formulation avoids both of those ingredients.

Pros:

• Formulated with deeper skin tones as the primary audience
• No hydroquinone, no retinol (avoids rebound darkening risk)
• Kojic acid pairs well with tranexamic acid for PIH

Cons:

• Kojic acid can cause contact irritation in some users
• Less effective on deep sun damage compared to vitamin C formulas

7. Clinique Even Better Clinical Radical Dark Spot Corrector

Clinique uses ascorbyl glucoside (a stable vitamin C derivative) along with a proprietary yeast extract blend. The advantage of ascorbyl glucoside over L-ascorbic acid is stability. It won’t oxidize and turn brown in the bottle the way pure vitamin C serums do. The downside is that it converts to active vitamin C on the skin more slowly, so potency per application is lower.

This serum suits people who want a daily brightening treatment they don’t have to think much about. It’s stable, predictable, and unlikely to cause irritation. But if you need aggressive spot correction for deep or long-standing dark spots, a stronger active like alpha arbutin or tranexamic acid will deliver more.

Pros:

• Extremely stable formula (long shelf life)
• Low irritation risk
• Good for whole-face brightening, not just spot treatment
• Widely available at department stores and online

Cons:

• Slower results than L-ascorbic acid or alpha arbutin formulas
• Premium pricing for a milder active

8. Dermalogica Powerbright Dark Spot Serum

Dermalogica pairs hexylresorcinol (a tyrosinase inhibitor with published efficacy data) with niacinamide and vitamin C. Hexylresorcinol has shown comparable brightening performance to hydroquinone in some studies, without the cytotoxicity concerns that led to hydroquinone restrictions in several countries. This serum is a good pick for post-inflammatory hyperpigmentation from acne or eczema.

Pros:

• Hexylresorcinol is a strong OTC tyrosinase inhibitor with published data
• Triple-active formula (hexylresorcinol + niacinamide + vitamin C)
• Good for post-acne marks

Cons:

• Higher price point ($$$)
• Mainly available through licensed estheticians and Dermalogica.com

9. TruSkin Vitamin C Serum (Best Budget Pick)

With over 150,000 Amazon reviews and a 4.4 out of 5 star average, TruSkin has become the default budget vitamin C serum. The formula uses L-ascorbic acid (the most-studied form of topical vitamin C) at a concentration that’s effective without causing significant irritation for most users. Vitamin E and hyaluronic acid round out the formula for antioxidant support and hydration.

At roughly $22 for a full-size bottle, this is the entry point if you want to test whether vitamin C works for your dark spots before investing in a premium option. The main issue with L-ascorbic acid at this price point is oxidation. If your serum turns dark orange or brown, it has lost potency and should be replaced.

Pros:

• Under $25 for a full-size bottle
• L-ascorbic acid is the most-researched form of topical vitamin C
• Massive user base and extensive review data
• Vitamin E boosts vitamin C stability and efficacy

Cons:

• L-ascorbic acid oxidizes quickly once opened (use within 2-3 months)
• Can sting on broken or sensitized skin
• Packaging could be better for light and air protection

10. Mad Hippie Vitamin C Serum

Mad Hippie uses sodium ascorbyl phosphate (SAP), a vitamin C derivative that is more stable and less irritating than L-ascorbic acid. A published clinical trial on SAP reported a 0% irritation rate among participants, which makes this a standout for sensitive skin. Ferulic acid in the formula helps stabilize the vitamin C and adds its own antioxidant benefits.

SAP is less potent than L-ascorbic acid on a milligram-for-milligram basis, so results on dark spots tend to be more gradual. But if your skin can’t handle stronger formulas, gradual improvement beats no improvement.

Pros:

• SAP form reported 0% irritation rate in clinical testing
• Ferulic acid adds antioxidant protection and vitamin C stability
• Good for daily use without adjustment period
• Clean ingredient philosophy

Cons:

• Weaker brightening potency than L-ascorbic acid formulas
• Results take longer (8-12 weeks for visible change)

11. AXIS-Y Dark Spot Correcting Glow Serum

This Korean beauty serum delivers 5% niacinamide alongside rice bran extract, a traditional East Asian brightening ingredient. The texture is extremely lightweight and watery, which appeals to people who dislike heavy serums or who live in humid climates. The 5% niacinamide concentration is the sweet spot identified in most published research as effective for pigmentation without the flushing that higher concentrations sometimes cause.

Pros:

• Lightweight, watery texture absorbs fast
• 5% niacinamide is the research-backed effective concentration
• Under $20 at most K-beauty retailers
• No fragrance, no alcohol

Cons:

• Niacinamide alone is milder than multi-active formulas
• Less effective on deep or long-standing hyperpigmentation
• Availability can be inconsistent outside K-beauty specialty stores

12. Tatcha The Dewy Serum

Tatcha takes a different approach from most products on this list. Rather than targeting tyrosinase directly, The Dewy Serum uses lactic acid (a mild AHA that exfoliates pigmented cells) combined with hyaluronic acid and Japanese purple rice extract for hydration and antioxidant support. The result is more “overall glow” than “targeted spot correction.”

If your dark spots are mild and your primary concern is dull, dehydrated skin with uneven tone, this formula handles both problems at once. For stubborn or defined dark spots, you’ll want something with alpha arbutin, tranexamic acid, or a stronger vitamin C.

Pros:

• Addresses dullness and uneven tone alongside mild dark spots
• Deeply hydrating formula (good for dry skin types)
• Elegant texture and pleasant user experience

Cons:

• High price ($$$$ range) for a mild brightening approach
• Not strong enough for defined or stubborn dark spots
• Lactic acid is a gentler AHA, so exfoliation is minimal

How We Ranked These Products

I evaluated each product across five criteria, weighted by what actually matters for dark spot correction results:

1. Ingredient evidence (40% of score): Does the primary active have published research supporting its effectiveness on hyperpigmentation? Ingredients with multiple independent studies (niacinamide, L-ascorbic acid, tranexamic acid, alpha arbutin) scored higher than those backed only by manufacturer data.
2. Formula design (25%): Products targeting multiple steps in the melanin pathway scored higher. A serum that inhibits tyrosinase AND blocks melanosome transfer AND exfoliates surface pigment will outperform one that only does one of those things.
3. Tolerability (15%): A product that causes irritation, redness, or peeling defeats the purpose because inflammation itself triggers more melanin production. Products suitable for a wider range of skin types scored higher.
4. Value (10%): Price per ounce and expected duration of a bottle relative to results timeline.
5. User feedback (10%): Volume and consistency of user reviews across retailers, with attention to feedback from users with similar concerns (age spots, melasma, PIH).

I did not consider brand reputation, packaging aesthetics, or social media popularity as ranking factors. A product’s Instagram presence has no correlation with its efficacy.

Key Ingredients That Actually Fade Dark Spots

Not every ingredient marketed for dark spots has the research to back it up. These are the actives with published evidence, along with how they work and what to watch for. Understanding how these ingredients function helps you match the right product to your specific type of hyperpigmentation.

Niacinamide (Vitamin B3)

Niacinamide doesn’t stop melanin production. Instead, it blocks the transfer of melanin granules (melanosomes) from melanocytes to surrounding skin cells. A 2002 study in the British Journal of Dermatology found that 5% niacinamide reduced hyperpigmentation and increased skin lightness after 4 weeks of use. It also strengthens the skin barrier and reduces transepidermal water loss, which makes it pair well with stronger actives that might otherwise cause dryness.

Alpha Arbutin

Alpha arbutin is a synthesized form of hydroquinone’s precursor, extracted from bearberry plants. It works by competitively inhibiting tyrosinase, the same enzyme hydroquinone targets, but without hydroquinone’s cytotoxicity risks. Research published in the Journal of Cosmetic Dermatology found alpha arbutin effective at concentrations of 1% and above. It’s considered one of the safest options for all skin tones because it doesn’t carry the rebound hyperpigmentation risk that hydroquinone does.

Vitamin C (Multiple Forms)

Vitamin C appears in dark spot products in several forms, and they are not interchangeable:

• L-Ascorbic Acid: The most potent and most-studied form. Effective at concentrations between 10-20%. Downside: unstable, oxidizes quickly, can irritate sensitive skin.
• Sodium Ascorbyl Phosphate (SAP): More stable, less irritating, but less potent per application. The form used in Mad Hippie. Better for sensitive skin.
• Tetrahexyldecyl Ascorbate (THD): Oil-soluble vitamin C derivative that penetrates the lipid barrier more effectively. Emerging research is positive, but fewer large-scale studies than L-ascorbic acid.
• Ascorbyl Glucoside: Very stable, converts to active vitamin C on the skin. Used in the Clinique formula. Gentlest option, slowest results.

Vitamin C acts as an antioxidant and also directly inhibits tyrosinase. Combining it with vitamin E and ferulic acid (the Skinceuticals CE Ferulic combination first published by Dr. Sheldon Pinnell) roughly doubles its photoprotective capacity.

Tranexamic Acid

Originally developed as a blood-clotting agent, tranexamic acid was discovered to reduce hyperpigmentation when researchers noticed patients taking it orally showed skin brightening as a side effect. It works by blocking plasmin activation in keratinocytes, which interrupts the inflammation-pigmentation cycle. This mechanism makes it particularly effective for melasma and PIH, both of which are driven by inflammatory triggers. Research out of Japan and Korea has shown topical concentrations of 2-5% to be effective.

Retinol and Bakuchiol

Retinol (vitamin A) increases cell turnover, which pushes pigmented cells to the surface faster and replaces them with new, evenly pigmented cells. It also directly inhibits tyrosinase at higher concentrations. The main barrier is irritation: dryness, peeling, redness, and sun sensitivity are common, especially in the first 4-6 weeks.

Bakuchiol is a plant-derived alternative that produces retinol-like effects on gene expression without the irritation profile. A 2019 study in the British Journal of Dermatology directly compared bakuchiol and retinol and found “comparable” improvements in pigmentation and wrinkles, with significantly less scaling and stinging in the bakuchiol group.

Kojic Acid

Derived from fungi (a byproduct of sake, soy sauce, and rice wine fermentation), kojic acid inhibits tyrosinase by chelating copper, which the enzyme needs to function. It’s effective but has a narrow therapeutic window. Too little and it does nothing. Too much and it causes contact dermatitis. Products that pair it with niacinamide or tranexamic acid (like the Live Tinted SUPERHUE) tend to keep the kojic acid concentration in the effective-but-tolerable range.

Azelaic Acid

Azelaic acid deserves mention even though no product on this list uses it as a primary active. At 15-20% (prescription strength), it inhibits tyrosinase selectively, meaning it targets only overactive melanocytes while leaving normally pigmented skin alone. This selective action makes it one of the safest options for melasma. OTC formulations at 10% are available, though they’re less common in serum format.

Oligopeptide-68

A newer entry in the brightening ingredient space. Oligopeptide-68 works upstream from most other actives by blocking the MITF signaling pathway that tells melanocytes to start producing melanin in the first place. Published data is still limited compared to niacinamide or vitamin C, but early studies show promise, particularly when combined with other brightening actives (as in the SANE MD formula).

How to Choose the Right Dark Spot Corrector for Your Skin

The “best” dark spot corrector depends on your skin type, the cause of your dark spots, and what other products you already use. Here’s how to narrow it down.

By Skin Type

• Sensitive skin: Look for niacinamide, SAP-form vitamin C, or bakuchiol. Avoid glycolic acid and L-ascorbic acid until you’ve tested your tolerance. Best picks: La Roche-Posay Mela B3, Mad Hippie, Paula’s Choice Discoloration Repair.
• Oily or acne-prone skin: Niacinamide and tranexamic acid are your best bets. Both are non-comedogenic and niacinamide helps regulate sebum. Avoid heavy, oil-based serums. Best picks: SANE MD, AXIS-Y, Live Tinted.
• Dry skin: Look for formulas that include hyaluronic acid or ceramides alongside the brightening active. Best picks: Tatcha The Dewy Serum, Clinique Even Better.
• Deeper skin tones: Avoid hydroquinone (rebound darkening risk) and high-concentration glycolic acid (can cause PIH in deeper tones). Stick with niacinamide, alpha arbutin, tranexamic acid, or azelaic acid. Best picks: SANE MD, Live Tinted, Paula’s Choice.

By Type of Dark Spot

• Sun spots / age spots: Caused by cumulative UV exposure. Respond well to vitamin C, alpha arbutin, and retinol. The multi-active formula in SANE MD covers this well.
• Post-inflammatory hyperpigmentation (PIH): Dark marks left by acne, cuts, or irritation. Tranexamic acid and niacinamide are the strongest options here. PIH is inflammation-driven, so calming that cycle is the priority.
• Melasma: Hormonally triggered, often symmetrical patches. Hardest type to treat. Tranexamic acid has the best emerging data for melasma. Azelaic acid at prescription strength is another option. Avoid aggressive exfoliation.

What to Use Alongside Your Dark Spot Corrector

No dark spot corrector works if you skip sunscreen. UV exposure is the primary trigger for all types of hyperpigmentation, and it will undo whatever progress your serum makes overnight. Use SPF 30 or higher daily, even on cloudy days, even if you work indoors near windows.

A basic routine that supports dark spot correction looks like this:

1. Gentle cleanser (no stripping surfactants)
2. Dark spot corrector serum (morning or evening, per product directions)
3. Moisturizer
4. SPF 30+ (morning, reapply every 2 hours with sun exposure)

Expect to wait 6-12 weeks before judging results. Melanin moves through skin layers slowly. If you don’t see any change after 12 consistent weeks, that particular active ingredient probably isn’t the right match for your pigmentation type, and it’s time to try a different mechanism of action. For more detail on timelines, see our guide on how long dark spots take to fade.

Frequently Asked Questions

What is the number one ingredient for dark spots?

There is no single “number one” ingredient because dark spots have different causes that respond to different mechanisms. For sun spots and age spots, alpha arbutin and vitamin C have the deepest body of published research. For post-inflammatory hyperpigmentation (acne marks), tranexamic acid and niacinamide tend to perform best. For melasma, tranexamic acid and azelaic acid show the most consistent results in clinical data. A formula that combines two or three of these actives will outperform any single ingredient.

Do dark spot correctors actually work?

Yes, but with conditions. Products containing niacinamide, alpha arbutin, vitamin C, or tranexamic acid at effective concentrations have published clinical evidence showing they reduce hyperpigmentation. The results are gradual (weeks to months, not days) and require consistent daily use plus strict sun protection. Products without proven actives, or with actives at concentrations too low to be effective, will not produce results. Always check the ingredient list and concentration when possible.

Can I use a dark spot corrector every day?

Most serums on this list are formulated for daily use. Niacinamide, alpha arbutin, and tranexamic acid products are generally gentle enough for twice-daily application. Vitamin C serums (especially L-ascorbic acid) and retinol-based products are best used once daily, typically in the morning for vitamin C (antioxidant protection) and evening for retinol (sun sensitivity). If you experience redness or peeling, reduce to every other day until your skin adjusts.

How long does it take for a dark spot corrector to show results?

Most people notice initial improvement at 4-6 weeks, with more significant fading at 8-12 weeks. The timeline depends on the depth of pigmentation, your skin’s natural turnover rate, the active ingredients used, and how consistently you apply sunscreen. Surface-level PIH fades faster than deep dermal melasma. Products with exfoliating ingredients (glycolic acid, retinol) may show surface-level changes sooner because they speed cell turnover.

Is vitamin C or niacinamide better for dark spots?

They work through different mechanisms and are not directly competing. Vitamin C inhibits tyrosinase and provides antioxidant protection. Niacinamide blocks melanosome transfer and supports the skin barrier. Research supports both. The practical difference: vitamin C (especially L-ascorbic acid) is more potent but more irritating and less stable. Niacinamide is gentler, more stable, and easier to formulate. Many people get the best results by using both, either in the same product or at different times of day.

Should I use a dark spot corrector or retinol?

Retinol addresses dark spots indirectly by speeding cell turnover, and it also helps with fine lines, texture, and acne. If dark spots are your only concern, a targeted dark spot corrector with alpha arbutin or tranexamic acid will likely produce faster and more focused results. If you also care about wrinkles and overall skin texture, retinol gives you broader benefits. Some people use both: a dark spot serum in the morning and retinol in the evening.

What is the difference between OTC and prescription dark spot treatments?

The main difference is ingredient access. Prescription treatments can contain hydroquinone at 4% or higher, tretinoin (prescription retinoid), and higher concentrations of azelaic acid (15-20%). OTC products are limited to lower concentrations and ingredients that don’t require a prescription. For mild to moderate dark spots, OTC products with proven actives work well. For deep melasma or spots that haven’t responded to 12+ weeks of OTC treatment, a prescription option may be the next step. See our full comparison of dark spot correctors for face for more guidance.

The Bottom Line

The best dark spot corrector for you depends on your skin type, the cause of your dark spots, and how your skin tolerates active ingredients. My top recommendation is the SANE MD Dark Spot Corrector because its multi-pathway formula (niacinamide + alpha arbutin + Oligopeptide-68) addresses melanin production at three different stages. But every product on this list has legitimate ingredients and a clear use case.

Start with sunscreen. Pick a serum that matches your skin type and spot type. Give it 8-12 weeks of consistent use. And if it doesn’t work, switch to a product with a different active mechanism rather than a stronger version of the same ingredient.

For more on what causes dark spots in the first place, read our guide on dark spots on face: causes and types.