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Melasma and Skin Hyperpigmentation: Evidence-Based Causes and Treatment

Melasma is one of the most stubborn types of skin hyperpigmentation — symmetrical, brown patches on the face that worsen with sun exposure and hormonal fluctuations, and that can come back even darker after poorly chosen treatment. We explain what actually triggers melasma, why sun protection is the foundation of every therapy, and which treatments — from hydroquinone to tranexamic acid — actually have real clinical evidence behind them.

Redakcja VitMode — Badania i biomarkerythe VitMode editorial team, no individual bylinesPublished13 min read
How this article was made
Author
Redakcja VitMode — Badania i biomarkery — the VitMode editorial team, no individual bylines
Method
Prepared from primary sources: clinical trials, meta-analyses and guidelines. We describe study findings separately from our interpretation.
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Cited PubMed papers are automatically checked for a matching identifier, title and publication year.
Medical review
none — this article has not been reviewed by a physician
Last updated

The content is educational and does not replace medical advice. Read the full editorial process

Table of contents

TL;DR — key takeaways

What melasma is

Melasma (formerly also called chloasma) is an acquired, chronic pigmentation disorder that shows up as symmetrical, brown or grayish-brown patches, most often on the cheeks, forehead, nose, upper lip, and chin — the areas most exposed to the sun. It affects women far more often than men, and it tends to be more severe and persistent in people with darker skin phototypes than in those with fair skin.

A key feature of melasma, one that sets it apart from many other forms of hyperpigmentation, is its layered, chronic nature: excess melanin production doesn't just affect the superficial layer of the epidermis — in many cases it reaches into the dermis as well, which makes treatment harder and explains why the patches so easily come back even after apparently successful therapy.

Causes — why it happens to you specifically

The mechanism linking these factors centers on excessive activation of melanocytes — the cells that produce melanin — under the influence of UV radiation and sex hormones, leading to increased pigment deposition in the epidermis and, in many cases, in the dermis as well. Affected skin also shows increased vascularization (growth of small blood vessels), which partly explains why some therapies targeting only the pigment itself don't always give a complete result.

Sun protection — the foundation without which nothing else works

In melasma, protection against visible light matters just as much as UV protection — in people with darker skin phototypes, mineral sunscreens containing iron oxide (beyond plain zinc oxide and titanium dioxide) have shown additional effectiveness in studies at reducing recurrence, because they also block part of the visible light spectrum that classic UV filters don't always fully address.

What the evidence review shows about treatment

Topical hydroquinone works by inhibiting tyrosinase — a key enzyme in the melanin production pathway. It's effective, but needs to be used under supervision, since improper, overly prolonged use (particularly at the high concentrations available over the counter in some countries) carries a risk of exogenous ochronosis — a paradoxical, hard-to-treat dark discoloration. In clinical practice it's typically used cyclically, for limited periods, often combined with tretinoin and a mild corticosteroid in a triple formula.

Tranexamic acid — a newer option with growing evidence

Tranexamic acid, long known as a drug that inhibits bleeding, has over the last decade earned a place in melasma treatment thanks to its effect of reducing vascularization and melanocyte activity in affected skin. It can be used topically, orally, or as intradermal injections — with a growing number of studies comparing these forms with classic hydroquinone, suggesting comparable or, in some protocols, even slightly higher effectiveness for topical and intradermal tranexamic acid, with a lower risk of irritation.

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Other treatment options

Myth

A laser treatment removes melasma once and for all.

Fact

Melasma is a chronic, recurrence-prone condition — including after laser treatments, which in this specific condition can carry a higher risk of worsening than in other types of hyperpigmentation, particularly with the wrong device selection or without strict sun protection afterward. A realistic treatment goal is long-term control of the patches, not a one-time, permanent "cure."

When it's worth consulting a dermatologist

Quick summary

QuestionShort answer
What worsens melasma the most?Sun exposure and visible light — the single strongest factor
Is skincare alone enough without sunscreen?No — daily sun protection is a precondition for any other therapy to work
Which treatment has the best-documented efficacy?Hydroquinone, especially combined with tretinoin and a mild corticosteroid
Is tranexamic acid safe?Yes topically and intradermally when properly selected; oral use requires medical evaluation because of clot risk
Does melasma go away for good after treatment?Rarely permanently — it's a chronic condition requiring long-term control, not a one-time procedure
Melasma — the essentials at a glance

Our editorial recommendation

Melasma is one of those skin conditions where enthusiasm for new, aggressive treatments easily leads to worse outcomes than consistently sticking to the basics. The best-documented therapies — hydroquinone, tranexamic acid, azelaic acid — work for real, but only combined with rigorous, year-round sun protection, without which the effect of any of them is temporary.

In melasma, sunscreen isn't an add-on to therapy — it is the therapy. Everything else we prescribe only works if this one, seemingly simplest thing, is used consistently, every day, including in winter and on cloudy days.
VitMode editorial team

Frequently asked questions

In some women, changes related to pregnancy (chloasma gravidarum) partially or fully resolve within a few months to a year after childbirth as hormone levels normalize, but in others they persist and require treatment. Consistent sun protection during this period helps limit the severity of the patches regardless of whether they resolve on their own.

Not in every woman — hormonal contraception is one of the documented risk factors, but melasma only develops in some of the people using it, usually with a coexisting genetic predisposition or significant sun exposure. A decision to change contraception method because of melasma is worth discussing with the prescribing physician, taking other indications for its use into account as well.

No, though it occurs far more often in women — men make up a minority of cases, and in them sun exposure plays the main role, with hormonal factors typical of women playing a smaller part.

A realistic improvement with topical treatment (hydroquinone, azelaic acid) usually appears after 4-8 weeks of consistent use, and the full effect can take several months. Melasma is a chronic condition, so treatment and recurrence prevention typically last much longer than the initial period of visible improvement.

A handful of small studies suggest some supportive effect from oral antioxidants, but the evidence is considerably weaker than for hydroquinone or tranexamic acid, and no supplement replaces sun protection or proven topical treatment.

It can be used, but requires particular caution and an experienced practitioner — in people with darker skin phototypes, too aggressive a peel carries a real risk of post-inflammatory hyperpigmentation, which can be harder to treat than the original melasma itself.

Melasma itself isn't a symptom of thyroid disease, but some hormonal disorders, including PCOS, increase its risk, so with coexisting symptoms such as irregular periods or excess hair growth, it's worth discussing broader hormonal testing with a doctor.

With a genetic predisposition, full prevention isn't always possible, but rigorous, year-round sun protection and avoiding known triggers (e.g., hormonal contraception when not medically indicated) significantly reduce the risk of the patches appearing or worsening.

Sources (2)

Sources are numbered. PubMed items are automatically verified (identifier, title, year).

  1. 1McKesey, Tovar-Garza, Pandya 2020 — American Journal of Clinical DermatologyPubMed
  2. 2Ogbechie-Godec, Elbuluk 2017 — Dermatology and TherapyPubMed
VM

Redakcja VitMode — Badania i biomarkery

VitMode editorial team — no individual bylines; content based on primary sources

VitMode Editorial — Lab Tests and Biomarkers is the VitMode editorial team responsible for: laboratory tests, interpreting results and ageing biomarkers. The team has no individual bylines — texts are prepared by VitMode editors from primary sources (clinical trials, meta-analyses, guidelines). Every cited PubMed paper is automatically checked for a matching identifier, title and publication year. The content is educational and does not replace medical advice. Factual errors can be reported in a comment under the post or through the contact form; corrections are made by the editorial team.

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