Melasma

Melasma is a pigmentation condition. The pigment-making cells in your skin (melanocytes) become overactive and produce too much melanin in certain spots. The result is flat brown or gray-brown patches, most often on the cheeks, forehead, upper lip, and chin.

Melasma is sometimes called the "mask of pregnancy" because it often appears during pregnancy, when hormone levels rise. But you don't have to be pregnant to get it. Birth control pills, sun exposure, and family history all play a role.

Melasma is harmless — it isn't dangerous, contagious, or a sign of skin cancer. But it's stubborn. Unlike a simple sun spot, melasma involves pigment cells that stay "switched on," so treatment is about long-term control, not a one-time fix.

Melasma shows up as flat patches of brown, tan, or gray-brown skin. The patches are usually symmetrical — they appear on both sides of the face in a mirror-image pattern.

The most common locations are:

• Cheeks
• Forehead
• Upper lip (often mistaken for a "mustache shadow")
• Chin
• Bridge of the nose

Less often, melasma appears on the neck, jawline, or forearms — areas that get regular sun. The patches don't itch, hurt, or feel raised. If a dark spot is scaly, bumpy, or growing quickly, it's probably something else and worth showing to a dermatologist.

Dermatologists classify melasma by how deep the pigment sits:

• Epidermal — pigment is in the top layer of skin. Patches look darker brown with clearer borders. This type responds best to topical treatment. (~20% of cases)
• Dermal — pigment has dropped into the deeper layer. Patches look more gray-blue with softer borders. This type is harder to treat with creams alone. (~15% of cases)
• Mixed — a combination of both, and the most common type. (~65% of cases)

A dermatologist can often tell the type using a Wood's lamp (a special UV light) in the office. The type matters because it helps predict which treatments will work.

Melasma doesn't have one single cause. It happens when three factors overlap:

Sun exposure. UV light is the biggest driver. It directly signals melanocytes to make more pigment. Visible light (including from bright indoor light and screens, in smaller amounts) can also darken melasma, especially in deeper skin tones.

Hormones. Estrogen and progesterone make pigment cells more sensitive to those sun signals. That's why melasma often starts during pregnancy or after starting birth control pills or hormone therapy.

Genetics. Melasma runs in families. If your mother or sister has it, your odds are higher. It's also more common in people with medium to darker skin tones (Fitzpatrick types III–V), whose pigment cells are naturally more reactive.

Newer research also shows melasma has a blood-vessel component — affected patches often have more tiny blood vessels, which release signals that keep pigment cells overactive. This is one reason some treatments target redness and blood vessels, not just pigment.

• Sun exposure — even a few minutes of unprotected sun can undo months of treatment
• Heat — hot yoga, saunas, and cooking over high heat can flare melasma, even without sun
• Visible light — blue light from the sun contributes, especially in deeper skin tones; tinted (iron oxide) sunscreens block it better than clear ones
• Hormonal changes — pregnancy, starting or switching birth control, hormone therapy
• Irritating skincare — harsh scrubs or products that inflame the skin can trigger more pigment
• Waxing — the heat and inflammation can worsen patches, especially on the upper lip

Most dermatologists can diagnose melasma just by looking at your skin. To confirm it and figure out the depth, they may:

• Use a Wood's lamp — a handheld UV light that helps show whether pigment is shallow (epidermal) or deep (dermal)
• Ask about your history — pregnancies, birth control, sun habits, and family history
• Rarely, take a small skin biopsy — only if the diagnosis is unclear or another condition needs to be ruled out

No blood tests are needed for typical melasma.

Home treatment starts with one non-negotiable step: strict, daily sun protection. Without it, nothing else works.

• Use a broad-spectrum SPF 30+ sunscreen every morning, and reapply every 2 hours outdoors. Tinted mineral sunscreens (with iron oxides) work best for melasma because they also block visible light.
• Wear a wide-brimmed hat and seek shade.

On top of sunscreen, several over-the-counter ingredients have real evidence behind them:

• Tranexamic acid (2–5%) — calms the signals that tell pigment cells to overproduce; one of the best-studied OTC options for melasma
• Azelaic acid (10–20%) — slows pigment production and calms inflammation; safe in pregnancy
• Vitamin C — an antioxidant that brightens and helps block pigment formation
• Niacinamide — slows the transfer of pigment into skin cells
• Retinol — speeds up cell turnover so pigmented cells shed faster (avoid during pregnancy)

Expect slow progress. Most people need 2–3 months of consistent use to see visible fading.

Prescription options are more powerful and usually work faster:

Hydroquinone (4%) — the classic skin-lightening agent. It blocks the enzyme pigment cells use to make melanin. Dermatologists usually prescribe it in cycles (for example, 3–4 months on, then a break) to avoid side effects from long-term use.

Triple combination cream — hydroquinone + tretinoin + a mild steroid in one cream. This is considered the most effective topical treatment for melasma and is often the first prescription a dermatologist reaches for.

Tretinoin — a prescription retinoid that speeds up skin cell turnover, helping pigmented cells shed.

Oral tranexamic acid — a low-dose pill taken twice daily for stubborn melasma that hasn't responded to creams. Studies show it can fade patches when topicals alone fail, and it works especially well for deeper (dermal) melasma. It's not for everyone — people with a history of blood clots can't take it.

Most treatment plans take 3–6 months to show clear results, and maintenance is usually needed to keep melasma from returning.

Procedures can help when creams plateau — but melasma is the one pigment condition where aggressive treatment can backfire. Too much heat or inflammation can make it darker. Gentle, low-energy approaches (light chemical peels, low-density lasers) done by someone experienced with melasma are safer than aggressive resurfacing.

See a dermatologist if:

• Over-the-counter treatment plus daily sunscreen hasn't helped after about 3 months
• The patches are spreading or darkening quickly
• You're not sure it's melasma — other conditions can look similar and are treated differently
• The pigmentation is affecting your confidence or daily life

A dermatologist can confirm the diagnosis, determine the depth, and build a plan that combines prescription treatment with realistic maintenance.

Several conditions cause facial dark patches and are easy to confuse with melasma:

• Post-inflammatory hyperpigmentation (PIH) — dark marks left behind after acne, a rash, or an injury. PIH follows a breakout or irritation; melasma appears without one.
• Solar lentigines (sun spots) — small, well-defined spots from sun damage. They're usually scattered and asymmetric, while melasma forms larger, symmetric patches.
• Drug-induced pigmentation — some medications (like minocycline) can cause gray-blue discoloration.
• Ochronosis — a rare gray-blue darkening caused by overusing hydroquinone, which is why it should be used under supervision.
• Hori's nevus — gray-brown spots on the cheekbones, more common in East Asian skin; it sits deeper and needs laser treatment, not creams.

Because the treatments differ, an accurate diagnosis matters.