Melasma: Why It Happens and What a Doctor Recommends

You notice it gradually — a darkening across your cheeks, or a shadow on your upper lip that wasn't there before. Melasma is one of the most common and most frustrating skin conditions I see. Not because it's dangerous, but because it's stubborn, it's visible, and it often appears during times of life that are already overwhelming.

What Melasma Is

Melasma is a chronic pigmentary disorder that produces symmetrical, blotchy brown or grayish-brown patches on the face. It occurs when melanocytes — the cells that produce skin pigment — become hyperactive in certain areas.

Unlike a simple dark spot from a healed pimple, melasma involves a deeper dysfunction in how melanocytes respond to stimulation. They're essentially stuck in overdrive, producing excess pigment in response to triggers that don't affect other areas of your skin.

Where It Shows Up

Melasma has three classic patterns:

• Centrofacial (most common): Cheeks, forehead, nose, upper lip, chin
• Malar: Cheeks and nose only
• Mandibular: Along the jawline

The symmetry is characteristic. If you have dark patches on both cheeks that roughly mirror each other, melasma is high on the list.

Why It Happens

Hormones

Hormones are the primary driver, which is why melasma is sometimes called the "mask of pregnancy." Estrogen and progesterone stimulate melanocytes, and fluctuations in these hormones can trigger or worsen the condition.

Common hormonal triggers:

• Pregnancy: Up to 70% of pregnant women develop some degree of melasma
• Oral contraceptives: Starting, stopping, or switching birth control pills
• Hormone replacement therapy
• IUDs with hormonal components
• Thyroid dysfunction: Can indirectly influence pigmentation

Ultraviolet Light

UV exposure is the single most important environmental trigger. Even small amounts of unprotected sun exposure can undo months of treatment progress. UV light directly stimulates melanocytes to produce more pigment, and in melasma-prone skin, this response is exaggerated.

What makes this especially challenging: visible light (the kind from your phone, computer, and indoor lighting) can also trigger melasma, though to a lesser degree than UV. This is why iron oxide-containing sunscreens (tinted formulas) are recommended — they block visible light in addition to UV.

Heat

Heat alone — independent of UV light — can trigger melanocyte activity. This is why melasma often worsens in summer beyond just sun exposure. Hot kitchens, saunas, intense exercise outdoors, and even hot yoga can contribute.

Genetics

Melasma runs in families. If your mother or sister has it, your risk is significantly higher. It's also far more common in people with medium-to-darker skin tones — those with more melanocyte activity at baseline.

Why Melasma Is So Stubborn

Here's what makes melasma different from other forms of hyperpigmentation: the melanocytes in melasma-affected skin have undergone structural changes. They have more blood vessels feeding them, more mast cells around them, and a compromised basement membrane. The entire microenvironment of the skin is altered.

This means you're not just dealing with excess pigment sitting in the skin — you're dealing with melanocytes that are primed to overproduce pigment at the slightest provocation. This is why melasma so frequently recurs even after successful treatment.

Treatment: What Actually Works

Step 1: Sun Protection (This Is Treatment, Not Prevention)

For melasma, sunscreen isn't supplementary — it's therapeutic. Without it, nothing else works.

• SPF 30-50, broad-spectrum: Applied every morning, reapplied every 2 hours if outdoors
• Tinted mineral sunscreen preferred: Iron oxide blocks visible light. Look for formulas with zinc oxide or titanium dioxide plus a tint.
• Hat and shade: Physical barriers matter, especially during peak UV hours (10am-4pm)

Step 2: Topical Treatments

Hydroquinone

Still the most effective topical depigmenting agent. Prescription 4% strength is standard. It works by blocking the enzyme (tyrosinase) that melanocytes need to produce melanin.

Used in cycles: typically 3 months on, then a rest period using non-hydroquinone maintenance agents. Continuous long-term use is not recommended.

Triple Combination Cream

Hydroquinone 4% + tretinoin 0.05% + fluocinolone 0.01% (a mild steroid). This combination is the most-studied and most effective topical treatment for melasma. The three ingredients work synergistically: hydroquinone blocks pigment production, tretinoin speeds cell turnover to shed pigmented cells faster, and the steroid reduces inflammation.

Tranexamic Acid

This has been a genuine advancement in melasma treatment. Available both as a topical serum and as a low-dose oral medication (250mg twice daily). It works by blocking the interaction between melanocytes and their surrounding environment — specifically the plasminogen/plasmin pathway.

Oral tranexamic acid is particularly effective for stubborn melasma that doesn't respond well to topicals alone. It's generally well-tolerated, though it's not appropriate for everyone (particularly those with a history of blood clots).

Azelaic Acid

Inhibits tyrosinase and reduces inflammation. A good option for maintenance or for patients who can't use hydroquinone. Also one of the few safe options during pregnancy.

Vitamin C

Useful as an adjunct, particularly in the morning under sunscreen. Provides some melanin-inhibiting activity plus antioxidant protection.

Step 3: Procedures (When Needed)

Chemical Peels

Superficial peels (glycolic acid, mandelic acid) can help when combined with topical treatment. They must be gentle — aggressive peels can trigger rebound pigmentation.

Microneedling

Can be effective, particularly when combined with tranexamic acid application. Creates micro-channels that allow better absorption of depigmenting agents.

Lasers

This is where I urge caution. Lasers can help melasma, but they can also make it dramatically worse. The heat and inflammation from laser treatment can trigger the exact melanocyte overactivation you're trying to prevent. Low-fluence Q-switched Nd:YAG lasers show the best results, but even those carry relapse risk.

Lasers for melasma should be considered a last resort, performed by someone with significant experience treating melasma specifically.

The Maintenance Reality

Here's the honest truth about melasma: it's a chronic condition that requires ongoing management. Even after successful treatment clears the visible patches, the underlying melanocyte predisposition remains.

A realistic long-term plan looks like:

1. Continuous daily sunscreen — forever, not just during treatment
2. Maintenance topicals — rotating agents like azelaic acid, vitamin C, tranexamic acid, or niacinamide to keep melanocytes calm
3. Avoiding triggers when possible — this might mean switching from oral contraceptives to non-hormonal birth control, or being extra vigilant during summer
4. Treating flares early — a short course of hydroquinone at the first sign of darkening is easier than treating fully established patches

What to Avoid

• Waxing the upper lip or other areas with melasma — the heat and inflammation trigger pigmentation
• Aggressive treatments that promise quick results — they usually cause rebound
• Frustration-driven product hopping — consistent, patient treatment works; switching products every few weeks does not
• Unprotected sun exposure — even 10 minutes can set back weeks of treatment

When to See a Doctor

If you're dealing with persistent, symmetrical dark patches on your face, it's worth getting evaluated. Melasma has a specific treatment approach that differs from other types of hyperpigmentation, and prescription medications (particularly the triple combination cream and oral tranexamic acid) are significantly more effective than anything available over the counter.

At Coral Health, we can diagnose melasma through a telehealth evaluation and build a treatment plan tailored to your triggers, skin tone, and preferences. Melasma requires patience, but with the right approach, significant improvement is absolutely achievable.

You don't have to accept it as permanent. You just need the right plan.