Melasma: Causes, Symptoms, Diagnosis, and Treatment

Melasma is a common, long-lasting pigment condition that causes flat tan, brown, or gray-brown patches, most often on the face. The patches usually appear in a fairly balanced pattern on both sides. They are made by pigment-producing cells that have become more active. Melasma is not an infection, is not contagious, and is not itself skin cancer. It can still be frustrating because it is visible, may take months to improve, and can return after treatment.

Sunlight is a major trigger. Hormonal changes, some medicines, irritation, and individual susceptibility can also matter. The best plan starts with confirming what the marks are, protecting skin from ultraviolet and visible light, and choosing gentle treatment that matches the person’s skin, health, and priorities. A dark spot should not automatically be assumed to be melasma: several conditions can look similar.

Quick takeaways: daily sun protection is the foundation; tinted sunscreen containing iron oxides may add protection from visible light; treatment is gradual and relapse is common; and strong lightening products or procedures can cause irritation, uneven lightening, scarring, or darker marks when used without expert guidance.

What is melasma?

Melasma is a pigmentary disorder in which melanocytes, the cells that make melanin, produce excess pigment in certain areas. Melanin gives skin its color and helps absorb some ultraviolet radiation. In melasma, pigment may collect in the upper skin, deeper layers, or both. The depth and other skin changes help explain why some patches fade more readily than others, but depth cannot be reliably judged at home by looking at color alone.

The usual pattern is made of flat patches with uneven outlines rather than raised bumps. They are often brown or tan, but gray-brown tones can occur as well. There are several facial patterns: a centrofacial pattern can involve the cheeks, forehead, nose, and upper lip; a malar pattern is centered on the cheeks; and a mandibular pattern follows the jawline. Some people develop similar patches on the neck, forearms, shoulders, or other areas exposed to light.

Melasma is more often noticed in adults and in people with medium or darker skin tones, but it can affect people of any skin color and gender. A family tendency may contribute. It may begin during pregnancy, when it is sometimes called the “mask of pregnancy,” or after starting hormonal medicine such as oral contraceptives or hormone therapy. These associations do not mean that every person with melasma has a hormone problem, or that prescribed medicine should be stopped. Discuss a suspected medicine trigger with the prescriber before changing it.

Melasma usually does not hurt or itch. A burning or stinging sensation may instead point to irritation from a product or to another skin condition. Even when it causes no physical symptoms, visible pigmentation can affect self-esteem, social comfort, or quality of life. Those concerns are valid. A care plan can include treatment, camouflage makeup, or both according to what matters to the person.

Causes and triggers: why patches can get darker

Melasma develops through a combination of pigment-cell activity, light exposure, hormones, genetics, and other local skin signals. No single trigger explains every case. The most established environmental trigger is sunlight: ultraviolet radiation can increase pigment production and make existing patches darker. This can happen throughout the year, including on cloudy days, and through ordinary outdoor exposure accumulated during daily activities.

Visible light, which is part of daylight that we can see, can also worsen pigmentation in some people, particularly those with darker skin tones. That is why a tinted sunscreen with iron oxides may be useful as an addition to ordinary broad-spectrum UV protection. A sunscreen that protects against UV but is not tinted can still be an important choice; the best sunscreen is one that provides suitable coverage and is comfortable enough to use consistently.

Hormonal changes can contribute. Melasma can show up during pregnancy or while using medicines that affect hormones, but the relationship varies from person to person. Some medications or scented products can also contribute to a light-triggered reaction in susceptible skin. Skin irritation matters too: scrubbing, stinging acids, fragranced products, or aggressive peels can inflame the skin, and inflammation may leave darker marks, especially in skin that tends to pigment after irritation.

Some people notice flares around heat or emotional stress. Research is less conclusive about these triggers than it is about light exposure, so avoid blaming yourself or making large lifestyle changes based on a single episode. A short, low-effort diary can help you notice whether a specific exposure reliably precedes worsening. Keep the routine sustainable: shade, clothing, and sunscreen are usually more practical than trying to avoid all warmth or normal daily activities.

How to tell melasma from other dark spots

Melasma is usually flat, asymptomatic, and distributed in a fairly symmetric pattern on sun-exposed areas of the face. Other marks can share some of those features. Post-inflammatory hyperpigmentation often follows acne, eczema, a rash, a burn, or a procedure. Solar lentigines (often called sun spots) tend to be separate, clearly outlined spots on sun-exposed skin. Freckles may darken in summer and fade in winter. Medication-related pigmentation and other pigment disorders can also look similar.

New, changing, raised, bleeding, or one-sided marks need an assessment rather than an assumption that they are melasma. A clinician should also review a patch that is painful, itchy, scaly, or inflamed, since classic melasma generally does not create those symptoms. This does not mean that every difference is an emergency; it means that diagnosis should come before applying a strong bleaching agent or scheduling a cosmetic procedure.

This comparison is only a guide, not a home diagnostic test. Several conditions overlap in color and appearance, and some can occur together. A dermatologist can assess distribution, skin history, medicines, pregnancy status, recent irritation, and prior treatments to decide what is most likely and what should be ruled out.

Diagnosis: what a clinician may do

A clinician usually diagnoses melasma by looking at the skin and asking when the patches began, where they have spread, whether they change with sun exposure, and what medicines or skin products are being used. They may ask about pregnancy, hormonal medicines, prior acne or rashes, procedures, family history, sunscreen habits, and what has already been tried. Bringing a list or photos of product labels can make this discussion more useful.

A hand-held magnifying device called a dermatoscope may help examine pigment patterns. A Wood lamp, which emits ultraviolet light, is sometimes used in a dim room to assess whether contrast changes under the lamp. Neither tool should be treated as a perfect measurement of how deep pigment lies or as a standalone yes-or-no test, especially across different skin tones. The clinical pattern and full history remain important.

A skin biopsy is not usually needed when the presentation is typical. If a patch is unusual, changing, or difficult to distinguish from another disorder, the clinician may recommend further examination or, occasionally, a biopsy. The point is not to test every facial mark; it is to make sure the diagnosis is sound before a treatment that could irritate or alter the skin.

For follow-up, clinicians may take standardized photographs or use a severity score to compare changes over time. Lighting, camera settings, and recent sun exposure can make photos look different, so a consistent setup helps. Progress can be slow and subtle; a record can show a change that is hard to notice from one day to the next.

Daily skin care and sun protection

Photoprotection is the foundation of a melasma plan, both during treatment and afterward. Choose a broad-spectrum sunscreen with SPF 30 or higher for exposed skin. Broad-spectrum means it protects against both UVA and UVB. A water-resistant formula is useful for swimming or sweating. Apply enough to cover exposed areas evenly, and reapply at least every two hours while outdoors, as well as after swimming or heavy sweating, following the label directions.

For additional visible-light protection, consider a tinted sunscreen that contains iron oxides. Tint can help reduce the white cast that some mineral sunscreens leave, which may make daily use more comfortable. A product's SPF is not a guarantee that all visible light is blocked, and tinted formulas vary. If you cannot find a suitable tinted option, keep using a sunscreen that gives reliable UV protection rather than going without.

Shade, a wide-brimmed hat, sunglasses, and tightly woven or sun-protective clothing provide layers of protection. Sunlight can reach skin during a walk, commute, gardening, or sitting near a bright window. A practical routine may be: sunscreen as part of morning skin care; hat and shade for sustained outdoor time; and reapplication when outdoor exposure continues. Avoid tanning beds and sunlamps, which can worsen pigmentation and harm skin.

Keep the rest of the routine calm. Use a gentle cleanser and moisturizer that do not sting. Introduce one new active ingredient at a time and stop if it causes persistent burning, swelling, or rash. A temporary mild sensation is not a sign that a product is working better. Irritation can worsen uneven pigmentation and make it difficult to know which product caused the problem.

Camouflage makeup is an option while waiting for treatment to work or if someone prefers not to use medication. It does not need to be hidden or justified: choosing makeup, choosing medical treatment, and choosing neither are all personal decisions. A clinician or makeup professional familiar with diverse skin tones can help find a natural-looking shade if desired.

Treatment options

There is no single treatment that works for everyone. A dermatologist may consider how long melasma has been present, skin tone, likely depth, pregnancy or breastfeeding, medicines, sensitivity, prior reactions, and cost. Often the plan combines consistent photoprotection with one or more topical treatments. Some people prefer a slow, low-irritation approach; others may discuss a procedure after weighing the added risks. Set goals around gradual fading and reduced contrast, not guaranteed permanent removal.

Prescription creams

Hydroquinone is a pigment-reducing medicine that clinicians sometimes prescribe for a limited course. It can irritate skin and should be used as directed, on the intended areas, with follow-up if there is persistent redness, burning, swelling, or unexpected darkening. Longer or unsupervised use can be harmful. In the United States, the FDA warns that over-the-counter skin-lightening products containing hydroquinone are not approved for OTC sale; it has received reports of rashes, facial swelling, and ochronosis, a potentially lasting dark discoloration. Rules differ by country, so check with a licensed clinician and local regulator rather than relying on an online seller.

A prescription combination may include hydroquinone, a retinoid such as tretinoin, and a corticosteroid to limit inflammation. Combination therapy can be effective for some patients, but each ingredient has risks and a role in the plan. It is not an everyday cosmetic cream for indefinite use. Follow the prescriber’s instructions about where, when, and how long to use it. Do not add other exfoliants or steroid creams unless the clinician approves.

Other topical options may include azelaic acid, vitamin C, kojic acid, cysteamine, or other pigment-modulating ingredients. The evidence, strength, and tolerability differ. Some nonprescription products can be useful for selected people, but an ingredient name does not guarantee a stable formula or meaningful benefit. Patch test as advised, introduce products gradually, and avoid combining multiple strong actives at once.

Pregnancy and breastfeeding

Melasma can appear during pregnancy and may lighten after delivery, though it can persist. Pregnancy changes which treatments are appropriate. The British Association of Dermatologists advises avoiding hydroquinone and retinoid creams during pregnancy. If pregnant, trying to conceive, or breastfeeding, ask a clinician before starting any lightening cream, oral medicine, or procedure. Do not stop prescribed hormonal medicine or start an oral treatment on your own.

Oral tranexamic acid

Tranexamic acid is a medicine usually used for other medical purposes that may be considered off-label for melasma in selected patients. It is not a routine supplement or a treatment to obtain without medical review. Oral use can increase the risk of blood clots in some circumstances, so a clinician must review health history, clotting risk, medicines, and other factors before deciding whether it is appropriate. There is no universal dose or duration for self-treatment. Topical forms have different considerations, but should also be discussed with a clinician if the skin is sensitive or the diagnosis is uncertain.

Peels, microneedling, and light or laser procedures

Some clinicians offer superficial chemical peels, microneedling, intense pulsed light, or laser treatment as an adjunct. Results vary, and procedures can trigger inflammation, post-inflammatory hyperpigmentation, patchy lightening, scarring, or relapse. Risk can be higher when the treatment is too aggressive or the provider is inexperienced with the person's skin tone and pigment disorders. Discuss qualifications, expected benefit, alternatives, aftercare, and the plan if pigmentation worsens. A procedure is not automatically a faster or safer shortcut.

Avoid home chemical peels, unlicensed injections, or unregulated creams advertised as instant whitening. Products imported or sold through informal channels may contain undisclosed ingredients, including mercury or potent steroids. Mercury is toxic and is banned in skin-lightening products in the United States. A product that causes rapid, dramatic change or does not list its ingredients should be treated with particular caution. Seek medical advice if use is followed by a rash, swelling, unusual color change, or other symptoms.

What to expect and how to track progress

Melasma tends to respond slowly. The American Academy of Dermatology notes that a treatment plan may take about three to twelve months to show results, and longstanding melasma can take longer. Some people improve partially; some need to change or stop a treatment because of irritation; some have little change despite consistent care. The outcome is not a measure of effort or personal worth.

Relapse is common, particularly after sun exposure or when maintenance protection falls away. Many people need long-term sun protection even after patches fade. This does not mean that treatment has failed; it reflects the chronic tendency of the pigment cells to react. A clinician can discuss whether to continue, taper, or switch medication and how to reduce irritation between treatment courses.

Take progress photos under similar lighting every few weeks rather than inspecting the skin repeatedly each day. Note treatment use, irritation, outdoor exposure, and any new products. Avoid increasing a medication or adding another active ingredient because progress looks slow. If there is no improvement after the agreed review period, or if the skin becomes inflamed or darker, check in with the prescriber so the diagnosis and plan can be reassessed.

Seek prompt clinical assessment for a new or changing mark that is asymmetric, raised, bleeding, ulcerated, or otherwise unlike the surrounding patches. Also ask for care if a product causes facial swelling, blistering, severe burning, or a spreading rash. Those signs may indicate a different problem or a reaction that needs attention, rather than ordinary melasma.

Questions to ask at an appointment

• Does the pattern look like melasma, or could another condition be causing these spots?
• Which sunscreen and skin-care routine are realistic for my skin tone, budget, and daily schedule?
• Which treatment ingredients fit my health history, pregnancy or breastfeeding status, and sensitivity?
• How long should I use each product, what side effects should prompt me to stop, and when should we review progress?
• If a procedure is being considered, how often does it worsen pigmentation in skin like mine, and what alternatives are available?
• Could a medicine be contributing, and who should I talk to before changing it?

Bring product names or photos, a list of medicines and supplements, and a timeline of when the patches began. It is useful to mention both prescription and nonprescription products, including online lightening creams. Honest details help the clinician identify irritants and avoid unsafe combinations.

Frequently asked questions

Sources and further reading

• American Academy of Dermatology: Melasma overview
• American Academy of Dermatology: Diagnosis and treatment
• American Academy of Dermatology: Self-care and sun protection
• DermNet: Melasma
• U.S. Food and Drug Administration: Skin product safety
• British Association of Dermatologists: Melasma patient information leaflet
• Expert panel consensus on photoprotection for skin of all colors

Medical information notice: This educational article is not a diagnosis or a substitute for individualized medical care. Pigmented marks can have different causes. Consult a qualified health professional for diagnosis and before starting prescription treatments, oral medicines, pregnancy-related care, or procedures. Product regulations vary by country.