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Medically reviewed & updated
Medically reviewed by the HealthVetted Medical Board
Melasma is a common, chronic skin condition that causes symmetrical brown, tan, or gray-brown patches of hyperpigmentation, most often on the face, driven by overactive pigment-producing cells. Hyperpigmentation is the broader umbrella term for any darkening of the skin from excess melanin — melasma is one specific, often stubborn, sun- and hormone-related form of it.
Hyperpigmentation simply means areas of skin that are darker than the surrounding skin. It happens when melanocytes — the cells that make the pigment melanin — produce too much, or deposit it unevenly. There are several distinct types, and telling them apart matters because they are treated differently:
Melasma (ICD-10 code L81.1) typically appears as ill-defined, blotchy patches with a "lacy" or map-like border. It favors the centrofacial pattern (forehead, cheeks, nose, upper lip, chin), the malar pattern (cheeks and nose), and the mandibular pattern (jawline). It can also occur on sun-exposed areas like the forearms and neck. When melasma develops during pregnancy it is often called chloasma or the "mask of pregnancy."
Melasma is benign — it is not skin cancer, it is not contagious, and it carries no physical health risk. But because it is highly visible and prone to relapse, it commonly affects quality of life and confidence, which is why effective, evidence-based management matters.
Melasma arises from an interaction of several triggers rather than a single cause (StatPearls). The three most established drivers are:
Sun exposure is the single most important and modifiable trigger. UV radiation stimulates melanocytes to produce more melanin, and research shows that visible light (including high-energy blue light from the sun and, to a lesser extent, screens) can also worsen melasma — particularly in people with darker skin. This is why melasma flares in summer and fades somewhat in winter, and why sun protection is the cornerstone of every treatment plan.
Melasma is strongly associated with female sex hormones (estrogen and progesterone). Common hormonal triggers include pregnancy, combined oral contraceptives, and hormone replacement therapy. The pregnancy-related "mask of pregnancy" frequently appears in the second or third trimester and often fades on its own in the months after delivery or after stopping hormonal contraception (Harvard Health), though it does not always resolve completely.
A large share of people with melasma report a family history, indicating an inherited susceptibility in how their melanocytes respond to triggers.
Who is most at risk:
Other contributing factors can include certain medications and cosmetics that cause skin irritation or photosensitivity, and possibly thyroid dysfunction. Importantly, melasma is now understood to be more than a pigment problem — research points to involvement of the skin's blood vessels, a disrupted skin barrier, and signs of photoaging in affected skin, which helps explain why it can be so persistent (PMID 36817641, "New Mechanistic Insights of Melasma," *Clin Cosmet Investig Dermatol* 2023).
Melasma is defined by its appearance, not by physical sensations. Key features:
If a pigmented spot is itchy, painful, bleeding, rapidly changing, raised, has irregular or jagged borders, or contains multiple colors within a single lesion, it is not typical melasma and should be evaluated promptly to rule out other conditions, including skin cancer.
Melasma is usually a clinical diagnosis — a dermatologist or clinician recognizes it by its characteristic symmetrical pattern and history. Several tools support and refine the diagnosis:
For tracking severity and treatment response, clinicians often use the Melasma Area and Severity Index (MASI), a standardized score based on the area involved, the darkness of the pigment, and how uniform (homogeneous) it is. MASI is used mainly in clinical practice and research to objectively measure improvement over time rather than as a diagnostic threshold.
Melasma is treatable but chronic and relapse-prone, so the goals are to lighten existing pigment, prevent new pigment, and maintain results long-term. Treatment is layered, starting with foundational measures and escalating under medical supervision. Patience is essential — meaningful improvement typically takes 8–12 weeks or longer.
No treatment works without rigorous photoprotection.
For milder cases or maintenance, several topical ingredients can gradually lighten pigment:
For moderate-to-severe or persistent melasma, dermatologists turn to prescription therapy:
Used cautiously and usually after topicals, since aggressive procedures can paradoxically worsen melasma (especially in darker skin):
The American Academy of Dermatology (AAD) and recent expert consensus statements emphasize a stepwise, individualized approach centered on photoprotection, topical therapy first, and careful escalation, with particular caution in skin of color.
Melasma cannot always be prevented, but its onset and recurrence can be substantially reduced, and it is best thought of as a long-term condition to manage rather than cure.
Effective long-term strategies include:
Because sun and hormones drive relapse, even well-cleared melasma commonly returns after sun exposure, pregnancy, or stopping treatment — so ongoing maintenance is the norm, not a sign of failure.
Melasma itself is harmless, but professional evaluation is worthwhile to confirm the diagnosis, rule out other causes, and build an effective plan. See a clinician or dermatologist if:
Seek prompt medical evaluation — these are red flags that suggest something other than melasma:
These features warrant evaluation to exclude skin cancer and other dermatologic conditions.
The outlook for melasma is good in terms of health but variable in terms of clearance. It is entirely benign and never becomes cancerous. Many cases — especially pregnancy- or contraceptive-related melasma — fade significantly within months once the hormonal trigger is removed, particularly with diligent sun protection. Epidermal (surface) melasma generally responds better to treatment than dermal or mixed types.
That said, melasma is notoriously chronic and recurrent. Most people achieve meaningful lightening with consistent treatment, but complete and permanent clearance is uncommon, and flares are expected with sun exposure or hormonal changes. With realistic expectations and ongoing maintenance — above all, rigorous photoprotection — most people can keep their melasma well controlled over the long term.
Often, yes — at least partially. Melasma triggered by pregnancy commonly fades over the months following delivery or after stopping hormonal contraception (Harvard Health). However, it doesn't always disappear completely, and sun exposure can keep it active. Diligent daily sunscreen helps it resolve faster and reduces the chance it persists. Because several treatments are avoided in pregnancy and breastfeeding, ask your clinician which options are safe before starting anything.
No. Age spots (solar lentigines) are discrete, well-defined individual spots caused mainly by cumulative sun damage, and they're usually easier to treat. Melasma is broader, blotchy, symmetrical, hormonally influenced, and far more prone to recurrence. The distinction matters because treatments and expectations differ.
Melasma is best described as manageable rather than curable. Treatments can lighten it significantly, but because the underlying tendency remains and triggers like sun and hormones persist, it commonly recurs. Long-term control with photoprotection and maintenance therapy is the realistic goal.
Yes. Melasma is sensitive to both UV and visible light, and meaningful exposure occurs through windows, during brief outdoor periods, and on cloudy days. Broad-spectrum sunscreen — ideally a tinted formula with iron oxides to block visible light — applied daily and reapplied with exposure is the most effective single thing you can do to prevent worsening and relapse.
Both are widely used and effective when prescribed and monitored appropriately. Hydroquinone is the most-studied lightening agent but is used in supervised, time-limited courses to avoid side effects with prolonged use. Oral tranexamic acid is reserved for harder-to-treat cases and requires screening, since it carries a small risk of blood clots and isn't suitable for everyone. A clinician can determine what's right for your situation.
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*This page is for general educational purposes and is independently reviewed; it is not medical advice. Always consult a qualified healthcare professional about diagnosis and treatment for your individual situation.*
Melasma is caused by a combination of factors, but the two most important are sun and visible-light exposure and hormonal changes. UV light stimulates pigment-producing cells, while estrogen and progesterone sensitivity explains why melasma often starts or worsens during pregnancy or with birth control and hormone therapy. Genetics and having medium-to-darker skin also raise the risk.
Sometimes. When melasma is triggered by pregnancy or a hormonal medication, it may fade over several months after the pregnancy ends or the medication is stopped. However, sun exposure can keep it active, and in many people melasma persists for years or a lifetime. Consistent sun protection greatly improves the chance of fading and reduces recurrence.
No single treatment works for everyone, but daily broad-spectrum sunscreen is the non-negotiable foundation. Topical hydroquinone, often combined with tretinoin and a mild steroid, is among the most effective lighteners for limited courses. Azelaic acid, vitamin C, and oral tranexamic acid are other options. Lasers and peels are reserved for stubborn cases. A dermatologist can tailor the plan.
Not exactly. Hyperpigmentation is a broad term for any darkening of the skin from excess melanin, including sunspots and dark marks left after acne or injury (post-inflammatory hyperpigmentation). Melasma is one specific type, marked by symmetric brown-gray facial patches strongly linked to sun and hormones. Distinguishing melasma from other forms matters because treatment and prognosis differ.
Melasma cannot be cured in the traditional sense, and it tends to follow a chronic, relapsing course. Patches can be substantially lightened with treatment, but they often return with sun exposure, heat, or hormonal triggers. Because of this, success depends on long-term, daily sun protection and ongoing maintenance therapy rather than a short course of treatment.
Yes, sunscreen is the single most important step. Both ultraviolet and visible light drive melasma, so dermatologists recommend a daily broad-spectrum sunscreen of SPF 30 or higher, ideally SPF 50+ and tinted with iron oxides to block visible light. Without rigorous, year-round sun protection, even the best lightening treatments tend to fail or relapse quickly.
This page is for general information and is not medical advice. Always consult a qualified clinician about diagnosis and treatment. Individual results vary.