Melanin in Skin: What It Actually Does, and Why Indian Skin Marks So Easily

Melanin is the pigment produced by melanocytes in the epidermis that gives skin its colour and absorbs ultraviolet radiation before it reaches the DNA underneath. Melanin in skin is not a flaw to be corrected, and the reason Indian skin marks so readily is not that it holds more melanin, but that its melanocytes are larger, run higher tyrosinase activity and respond to inflammation by producing pigment where the inflammation happened. That single mechanism explains almost every pigmentation complaint in Indian skincare, from an acne mark that outlasts the spot by a year to a tan line that refuses to fade.

Melanin is a protective pigment, and melanin-rich skin is structurally different rather than simply darker. Research published in the British Journal of Dermatology found that melanosomes, the packets that carry melanin, are larger and distributed individually in dark skin, and intermediate in Asian skin. That same responsiveness is why post-inflammatory hyperpigmentation is more common and more persistent in Fitzpatrick skin types III to VI. A 2024 systematic review in the Journal of Cutaneous Medicine and Surgery found the average duration of post-inflammatory hyperpigmentation before treatment was 21 months. You cannot permanently reduce melanin, and you should not want to. You can reduce how often your skin is triggered into making extra.

What is melanin and what does it do?

Melanin is a pigment made inside melanocytes, specialised cells sitting in the basal layer of the epidermis. Melanocytes package melanin into organelles called melanosomes, then hand those melanosomes to the surrounding keratinocytes, which are the ordinary skin cells that make up most of the epidermis.

The enzyme that starts the process is tyrosinase. Tyrosinase converts the amino acid tyrosine into the precursors that eventually become melanin, which is why almost every pigment-targeting ingredient in skincare works by slowing tyrosinase down. StatPearls, the peer-reviewed clinical reference maintained on the NCBI Bookshelf, describes tyrosinase inhibitors simply as agents that prevent melanin production.

Melanin absorbs and scatters ultraviolet radiation before it can damage the genome of the cells beneath it. How that pigment is distributed across the epidermis, rather than its raw quantity alone, decides how much protection any given skin receives.

Eumelanin and pheomelanin: the two pigments, and which one dominates in Indian skin

There are two chemically distinct melanins. Eumelanin reads brown to black and is the more effective ultraviolet absorber. Pheomelanin reads yellow to red and is far weaker as a shield.

Everybody makes both. What varies is the ratio, alongside the size, number and degree of melanisation of the melanosomes carrying them. A 2024 systematic review in the Journal of Cutaneous Medicine and Surgery notes that people with skin of colour, defined there as Fitzpatrick skin types III to VI, have an increased size of melanosomes, a greater quantity of melanin and increased eumelanin specifically.

Skin at Fitzpatrick type IV or V is not paler skin with the brightness turned down. It runs a different pigment mix, in bigger packets, from more active cells.

The structural difference nobody explains: how melanosomes are packed

The clearest evidence on this comes from electron microscopy. In a study published in the British Journal of Dermatology in 2003, Thong and colleagues at National Taiwan University Hospital examined photoprotected forearm skin and counted how melanosomes sit inside keratinocytes across three groups.

In light Caucasian skin, melanosomes were predominantly clustered together in membrane-bound groups, at 84.5%. In dark African American skin, they were predominantly individual, at 88.9%. In Asian skin, the pattern was a mix, at 62.6% individual and 37.4% clustered.

Size followed the same gradient. Mean melanosome size measured 1.44 microns squared by ten to the minus two in dark skin, 1.36 in Asian skin, and 0.94 in Caucasian skin. Individually distributed melanosomes tended to be larger than clustered ones.

A separate 2022 review in Clinical, Cosmetic and Investigational Dermatology adds the cellular half of the picture, reporting that in dark skin the melanocytes themselves are significantly enlarged and transfer more melanosomes to the epidermis, driven by higher tyrosinase activity and larger, more acidic dendrites than in light skin.

Larger pigment packets, spread individually rather than bundled, distributed by bigger and busier cells. That is the reason melanin-rich skin reacts the way it does.

Why the same spot lasts months on Indian skin and weeks on paler skin

The system that protects melanin-rich skin from ultraviolet damage is the same system that overreacts to injury. When skin is inflamed by acne, eczema, a burn, waxing, a chemical peel or a laser session, the damaged tissue releases inflammatory cytokines, prostaglandins and reactive oxygen species. Those mediators stimulate melanocytes to produce excess melanin, which is transferred into the surrounding keratinocytes and, in some cases, leaks down into the dermis. The result is post-inflammatory hyperpigmentation.

Post-inflammatory hyperpigmentation is an acquired darkening of the skin that appears in the exact distribution of a previous inflammation or injury, caused by overproduction and irregular dispersion of melanin. StatPearls states plainly that the condition is more common and more severe in people with Fitzpatrick skin types III to VI, because they have greater baseline melanin production and more reactive melanocytes.

In people with darker skin tones who have acne, StatPearls reports the incidence of post-inflammatory hyperpigmentation can be as high as 65%. That is not a minority complication of acne in Indian skin. It is the default outcome.

The 21-month problem

The 2024 systematic review in the Journal of Cutaneous Medicine and Surgery pooled 46 studies covering 1,356 people with skin of colour. Across the studies that reported it, the average duration of post-inflammatory hyperpigmentation before any treatment began was 21 months. Of 1,332 cases, 92% were on the face. Of 1,225 cases where a cause was recorded, inflammatory conditions accounted for 89%, and acne alone accounted for 97% of those.

Depth decides the timeline. StatPearls distinguishes two forms. Epidermal post-inflammatory hyperpigmentation, where melanin accumulates in the basal and suprabasal layers, appears tan to dark brown and typically resolves or significantly improves within 6 to 12 months. Dermal post-inflammatory hyperpigmentation, where melanin granules escape into the dermis and are engulfed by macrophages to form melanophages, appears blue-grey, improves slowly and may be permanent.

A brown mark from last year's breakout is probably epidermal and will keep fading. A blue-grey mark left by an aggressive peel may not.

Can you reduce melanin? What that question actually means

Roughly 12,100 people a month in India search for how to reduce melanin, and another 720 search for how to reduce melanin in skin permanently. Both deserve a straight answer rather than a product. You cannot permanently reduce your melanin. Your baseline pigment is set by genetics and cannot be dialled down without disabling a protective system you need in Indian sun. What you can influence is the excess your skin produces on top of that baseline, in response to ultraviolet exposure and inflammation.

That is a different goal, and it changes what is worth buying. Nothing on a shelf changes your constitutional skin colour. Ingredients that slow tyrosinase, plus consistent ultraviolet protection, change how much extra pigment gets laid down after your skin is triggered.

What melanin does not do, and what no product can change

Melanin does not make sunscreen optional. Melanin-rich skin still tans, still pigments and still accumulates the ultraviolet-driven damage that drives uneven tone. StatPearls notes that recurrences of post-inflammatory hyperpigmentation are common, particularly without adequate photoprotection, and that sun exposure can intensify existing pigmentation.

Topical products do not clear post-inflammatory hyperpigmentation completely. In the 2024 systematic review, topical retinoids were the most studied intervention, used by 294 participants. No participant achieved complete resolution with them. 64% of 118 patients showed partial pigment reduction. Laser therapy was the only modality that produced complete clearance in any subgroup, at 26% of 165 patients, and it carried documented cases of making pigmentation worse.

Time does some of the work. Among 346 participants in that review who received no treatment at all, none cleared completely, 33% showed no response, and 62% still achieved partial pigment reduction on their own. Any product claiming credit for fading a mark is competing against a background rate of spontaneous improvement that is far from zero.

The review's own conclusion was that there is a lack of robust efficacy across all treatment modalities for skin of colour. That is the honest state of the evidence in 2026.

What actually helps, in order of what the evidence supports

1. Stop the inflammation first. Every credible treatment sequence starts by treating the active condition causing the pigment. If acne is still erupting, fading marks is a losing battle, because 97% of inflammation-driven post-inflammatory hyperpigmentation in the pooled data traced back to acne. Treating the acne is the pigmentation intervention.
2. Do not pick, scrub or over-treat. Trauma is the second-largest category of trigger. In the pooled review, 11% of cases were trauma-related, with laser sessions, hair removal, light therapy and chemical peels accounting for most of them. Aggressive at-home exfoliation belongs on the same list. In melanin-rich skin, the treatment can create the problem.
3. Wear broad-spectrum sunscreen daily, without exception. Photoprotection is the one intervention that appears in every clinical pathway for pigmentation in skin of colour, both as prevention and as the base layer under any active treatment. Vilvah's Skin Finish Sunscreen SPF 50 PA++++ at ₹599 uses three advanced ultraviolet filters, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Ethylhexyl Triazone and Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, alongside Titanium Dioxide, with Niacinamide and ceramides in the base.
4. Use a tyrosinase-targeting active, and give it months, not weeks. Alpha arbutin works by interfering with tyrosinase rather than by stripping pigment that is already there, which is why it suits melanin-rich skin better than harsher routes. Vilvah's Milk Drops Brightening Serum at ₹640 is formulated at pH 5.50 to 6.00 with plant-derived alpha arbutin, rice milk extract, Cystoseira tamariscifolia marine algae extract and hyaluronic acid, and is fragrance free and non-comedogenic. Given that untreated marks average 21 months, judging any serum at four weeks is judging it too early.

Vilvah, founded in 2017 in Coimbatore by Kruthika Kumaran as India's first milk-based skin and hair care brand, treats Fitzpatrick type IV and V skin as the default case rather than the exception.

Frequently asked questions

What is melanin in skin?

Melanin is the pigment that gives skin, hair and eyes their colour. It is produced by melanocytes, specialised cells in the basal layer of the epidermis, and packaged into organelles called melanosomes that are then transferred into the surrounding keratinocytes. The enzyme tyrosinase starts the production process by converting the amino acid tyrosine into melanin precursors. Melanin exists in two chemically distinct forms. Eumelanin reads brown to black and absorbs ultraviolet radiation effectively. Pheomelanin reads yellow to red and is a much weaker absorber. Everyone produces both, and the ratio between them, along with melanosome size and distribution, is what determines visible skin colour and how skin behaves in sun.

Does Indian skin have more melanocytes than lighter skin?

The difference is not best described as a simple count. Research published in Clinical, Cosmetic and Investigational Dermatology in 2022 reports that in dark skin the melanocytes are significantly enlarged and transfer more melanosomes into the epidermis, driven by higher tyrosinase activity and larger, more acidic dendrites compared with light skin. Separately, electron microscopy work published in the British Journal of Dermatology in 2003 found that melanosomes in Asian skin were 62.6% individually distributed and 37.4% clustered, sitting between light Caucasian skin at 84.5% clustered and dark African American skin at 88.9% individual. Mean melanosome size also followed a gradient across the three groups. So the meaningful differences are in cell size, enzyme activity, pigment quantity and how the pigment packets are physically arranged, not in a headcount of melanocytes.

Why does Indian skin tan quickly and mark easily?

Both behaviours come from the same responsive pigment system. Melanocytes in skin of colour run higher tyrosinase activity and produce more eumelanin, so any stimulus that calls for pigment gets a fast and large response. Ultraviolet exposure is one such stimulus, which produces a tan. Inflammation is the other, and it produces post-inflammatory hyperpigmentation. When skin is inflamed by acne, eczema, waxing, a burn or a procedure, the released cytokines, prostaglandins and reactive oxygen species stimulate melanocytes to overproduce melanin in exactly the area that was inflamed. StatPearls reports that in people with darker skin tones who have acne, the incidence of post-inflammatory hyperpigmentation can be as high as 65%. The protection and the marking are two outputs of one mechanism.

How long does post-inflammatory hyperpigmentation take to fade?

Longer than most people expect. A 2024 systematic review in the Journal of Cutaneous Medicine and Surgery, covering 46 studies and 1,356 people with skin of colour, found the average duration of post-inflammatory hyperpigmentation before treatment began was 21 months. The depth of the pigment decides the outcome. StatPearls states that epidermal post-inflammatory hyperpigmentation, which appears tan to dark brown, typically resolves or significantly improves within 6 to 12 months. Dermal post-inflammatory hyperpigmentation, which appears blue-grey because melanin has been engulfed by macrophages in the dermis, improves slowly and may be permanent. A Wood lamp examination by a dermatologist can distinguish the two, which matters because the realistic prognosis is completely different.

Can you reduce melanin in your skin permanently?

No, and it is not a sensible goal. Baseline melanin is genetically determined, and it is the mechanism that absorbs ultraviolet radiation before it reaches the DNA in your skin cells. Suppressing it permanently would remove protection you need, particularly in Indian sun. What can be influenced is the excess pigment your skin produces in response to ultraviolet exposure and inflammation. That is what tyrosinase-targeting ingredients such as alpha arbutin address, and it is what daily broad-spectrum sunscreen prevents in the first place. Anyone promising permanent melanin reduction is either describing something that does not happen or describing something you should not want.

Does melanin mean I can skip sunscreen?

No. Melanin provides real ultraviolet absorption, but it does not remove the need for photoprotection, and in the context of pigmentation it arguably raises it. StatPearls notes that recurrences of post-inflammatory hyperpigmentation are common particularly without adequate photoprotection, and that sun exposure can intensify pigmentation and prolong healing. Daily broad-spectrum sunscreen use is described there as a foundational part of treatment rather than an optional extra. For melanin-rich skin the practical issue is that ultraviolet exposure does not usually announce itself as a burn. It announces itself months later as a mark that will not go.

Which ingredients actually work on pigmentation in melanin-rich skin?

The honest answer is that the evidence is thinner than the marketing. The 2024 systematic review in the Journal of Cutaneous Medicine and Surgery concluded there is a lack of robust efficacy across all treatment modalities studied in skin of colour. Topical retinoids were the most investigated option and produced partial pigment reduction in 64% of patients assessed, with no complete resolutions. Laser therapy was the only modality that fully cleared pigmentation in a subgroup, at 26%, while also carrying a documented risk of worsening it. Set against that, 62% of untreated participants still showed partial improvement over time. The practical conclusion is that tyrosinase-targeting actives and rigorous sun protection are worth using consistently and for months, and that no ingredient should be expected to clear a mark outright.

Sources

• Lawrence E, Syed HA, Al Aboud KM. Postinflammatory Hyperpigmentation. StatPearls, NCBI Bookshelf, updated 25 November 2024. https://www.ncbi.nlm.nih.gov/books/NBK559150/
• Mar K, Khalid B, Maazi M, Ahmed R, Wang OJ, Khosravi-Hafshejani T. Treatment of Post-Inflammatory Hyperpigmentation in Skin of Colour: A Systematic Review. Journal of Cutaneous Medicine and Surgery, 2024;28(5):473-480. https://pmc.ncbi.nlm.nih.gov/articles/PMC11514325/
• Thong HY, Jee SH, Sun CC, Boissy RE. The patterns of melanosome distribution in keratinocytes of human skin as one determining factor of skin colour. British Journal of Dermatology, September 2003;149(3):498-505. https://pubmed.ncbi.nlm.nih.gov/14510981/
• Markiewicz E, Karaman-Jurukovska N, Mammone T, Idowu OC. Post-Inflammatory Hyperpigmentation in Dark Skin: Molecular Mechanism and Skincare Implications. Clinical, Cosmetic and Investigational Dermatology, 2022;15:2555-2565. https://pmc.ncbi.nlm.nih.gov/articles/PMC9709857/