Melasma is a common skin condition that causes brown-to-gray patches on the face, most often on the cheeks, forehead, upper lip, chin, and jawline. The patches are flat, irregular in shape, and symmetrical, meaning they tend to appear in matching areas on both sides of the face. Melasma is harmless and painless, but it can be stubborn to treat and emotionally frustrating for people who have it.
What Melasma Looks Like
The hallmark of melasma is patchy discoloration on sun-exposed skin. The patches are flat (not raised or bumpy), don’t flake or scale, and don’t itch or hurt. That smooth, asymptomatic quality helps distinguish melasma from other conditions that darken facial skin, like eczema or contact dermatitis, which tend to involve inflammation, texture changes, or irritation.
Color ranges from light brown to dark brown to grayish-blue, depending on how deep the excess pigment sits in your skin. Patches that look brown typically involve the outermost skin layer (epidermis), while grayish or bluish tones suggest pigment has settled deeper into the dermis. Most people have a mix of both. The three most common facial patterns are centrofacial (forehead, nose, upper lip, chin), malar (cheeks), and mandibular (jawline).
Why It Happens
Melasma develops when the pigment-producing cells in your skin become hyperactive. These cells, called melanocytes, start churning out more melanin than usual and distributing it more aggressively to surrounding skin cells. Unlike a suntan, where pigment production ramps up temporarily and fades, melasma involves a sustained shift in how your melanocytes behave.
Several biological changes drive this. The melanocytes in affected skin show reduced “self-cleaning,” a recycling process that normally keeps pigment production in check. At the same time, cells in the deeper skin layers, including aging or damaged connective tissue cells, release chemical signals that push melanocytes to produce even more pigment. Estrogen also plays a direct role: it activates receptors on melanocytes that ramp up the enzymes responsible for making melanin. This is why melasma so often appears during pregnancy or while taking hormonal contraceptives.
Common Triggers
Three factors converge in most cases: sun exposure, hormonal changes, and genetic predisposition. You rarely get melasma from just one of these alone.
- Sunlight and visible light. Both UV radiation and visible light (the kind you can see, especially blue and violet wavelengths) trigger melanin production. These two types of light have a synergistic effect, meaning together they worsen melasma more than either would alone.
- Hormones. Pregnancy is the most well-known trigger, earning melasma the nickname “mask of pregnancy.” Hormonal birth control, hormone replacement therapy, and thyroid abnormalities are also associated with flares. Stress and anxiety can contribute through the hormonal pathways that connect the brain and adrenal glands.
- Heat. Prolonged exposure to heat, whether from cooking, occupational sources, or hot environments, has been shown to increase melasma severity the longer the exposure lasts.
- Genetics. A family history of melasma significantly raises your risk. People with medium to darker skin tones (Fitzpatrick skin types III through V) are most commonly affected, though melasma can occur in any skin tone.
Women develop melasma far more often than men, though men are not immune. The condition is particularly common during the reproductive years.
How Dermatologists Diagnose It
A dermatologist can usually identify melasma by looking at your skin. The symmetrical pattern, location on sun-exposed areas, and smooth texture are distinctive enough for a visual diagnosis in most cases. A biopsy is rarely needed.
To plan treatment, your dermatologist may want to know how deep the pigment goes. A Wood’s lamp, which shines a specific wavelength of ultraviolet light on the skin, is one of the oldest tools for this. Epidermal (surface-level) pigment becomes more visible under the lamp, while deeper pigment does not. However, this method has limitations. It works best on lighter skin tones and can be thrown off by topical products, sunscreen, or changes in blood vessels and collagen.
Dermoscopy, which uses a handheld magnifying device with polarized light, offers a more reliable assessment. Dark brown coloring with a well-defined pigment network points to epidermal melasma. Bluish or grayish tones with an irregular, blurred network suggest deeper (dermal) pigment. Dermoscopy also picks up the vascular component of melasma, which is increased blood vessel activity that can contribute to the condition. Knowing the depth of your pigment helps set realistic expectations: surface-level melasma responds better to treatment, while deeper pigment is more resistant.
First-Line Treatments
An international expert consensus identifies broad-spectrum sunscreen as essential and a triple combination cream (hydroquinone, a retinoid, and a mild corticosteroid) as the gold standard topical treatment. The most widely studied formulation combines 4% hydroquinone with 0.05% tretinoin. When a corticosteroid is included, it helps reduce irritation but limits how long you can safely use the product. The only FDA-approved triple combination is indicated for up to 8 weeks of continuous use.
Treatment takes patience. Most topical regimens require at least 8 to 12 weeks of consistent nightly use before you see meaningful lightening. In clinical studies, patients using a hydroquinone and tretinoin system saw progressive improvement over 12 weeks, with the option to continue for another 12. Some dryness and mild irritation are common early on, and your dermatologist may recommend a gentle moisturizer or low-dose hydrocortisone to manage it.
For people who cannot use hydroquinone or prefer alternatives, azelaic acid and kojic acid are supported by expert consensus as effective options. Oral tranexamic acid, a medication that interferes with the signals driving pigment production, has gained significant traction. In one study, patients taking it for six months saw their melasma severity scores drop from an average of 1.96 to 0.61, a roughly threefold improvement.
Procedures and Their Risks
Chemical peels and microneedling are sometimes used alongside topical treatments to help active ingredients penetrate better and speed up results. These are considered adjunctive, meaning they work best as add-ons to your daily regimen rather than standalone treatments.
Laser therapy is generally reserved for cases that haven’t responded to other approaches, and for good reason. While certain low-energy lasers have shown significant improvement (one study found 92.5% lightening in treated patients), the results came with serious caveats: 18% of patients experienced rebound hyperpigmentation, where the skin darkened again after treatment, and all patients in that study eventually saw their melasma return. Repeated laser exposure can actually stimulate melanin production in some areas, making the problem worse. Faint spotty lightening of the skin is another documented side effect, though it tends to improve over time.
Why Sunscreen Alone Isn’t Enough
Standard sunscreen, even with high SPF, only blocks UV radiation. Visible light, which makes up about 45% of solar radiation, passes right through most sunscreens and contributes to skin darkening in people with medium to darker skin tones. This is a major reason melasma can worsen even when you’re diligent about sunscreen.
Tinted sunscreens containing iron oxide offer a practical solution. Iron oxide absorbs, scatters, and reflects visible light in ways that clear sunscreens cannot. In clinical testing, iron oxide formulations significantly protected against visible-light-induced pigmentation compared to both untreated skin and a standard mineral SPF 50+ sunscreen. Tinted products serve a dual purpose: they block the light that triggers melasma while also providing cosmetic coverage that helps mask existing patches. For anyone managing melasma, switching to a tinted, iron-oxide-containing broad-spectrum sunscreen is one of the simplest and most impactful changes you can make.
Managing Expectations Long Term
Melasma is a chronic condition. Even after successful treatment clears visible patches, the underlying tendency for your melanocytes to overproduce pigment remains. Recurrence is extremely common, especially with sun exposure, hormonal changes, or stopping maintenance treatment. Most dermatologists recommend an ongoing regimen that includes rigorous sun protection, periodic use of a lightening agent, and avoidance of known triggers like heat and unprotected sun exposure. The goal shifts from “curing” melasma to managing it, keeping flares shorter and less intense over time.