What melasma actually is
Melasma is hormonally-driven hyperpigmentation. That single fact explains everything — why it appears, why it's hard to treat, and why it keeps coming back.
Unlike sun spots (caused by UV) or PIH (caused by inflammation), melasma is triggered by hormonal changes — pregnancy, oral contraceptives, HRT, or genetic predisposition activated by hormones. The hormones directly stimulate melanocytes to overproduce pigment, and UV exposure amplifies the signal.
It appears as symmetric patches (both sides of the face match) on the cheeks, forehead, upper lip, and nose bridge. It's sometimes called the "mask of pregnancy" because pregnancy is the most common trigger. It affects women more than men (90%+ of cases) and is more common in darker skin tones (Fitzpatrick III-V).
Why melasma is different from other dark spots
It's driven by internal signals, not external damage
Sun spots are caused by UV. PIH is caused by inflammation. Both are external triggers you can remove. Melasma is triggered by your own hormones — you can't "remove" the trigger without addressing the hormonal source. This is why it recurs.
It involves deeper skin layers
Melasma can exist in the epidermis (surface), dermis (deeper), or both. Epidermal melasma responds better to topical treatment. Dermal melasma is much harder to treat because the pigment is below the layers that topical creams can easily reach.
Heat triggers it — not just UV
Melasma is sensitive to both UV and heat. Infrared radiation, hot yoga, saunas, and even cooking over a hot stove can trigger flare-ups. SPF alone isn't enough — you need physical heat avoidance too.
It's managed, not cured
Setting realistic expectations is crucial. Melasma can be significantly improved and managed long-term, but it tends to recur when treatment stops or hormonal triggers return. Think chronic management like blood pressure — not a one-time fix.
What NOT to do with melasma
This section exists because the most common treatments for other types of hyperpigmentation can actively make melasma worse.
Don't start with laser treatments
Lasers generate heat. Heat triggers melasma. Many dermatologists now advise against laser for melasma entirely — and those who do use it proceed with extreme caution and specific devices only. Laser should be a last resort after extended topical treatment, not a first step.
Don't use aggressive chemical peels
Deep peels (TCA, high-concentration glycolic) create inflammation. Inflammation triggers melanocytes. With melasma, the melanocytes are already hyperactive — adding inflammatory stress can cause rebound darkening that's worse than the original.
Don't rely on SPF alone
SPF blocks UV but doesn't block visible light or heat — both of which trigger melasma. Tinted sunscreens with iron oxide block visible light. Physical heat avoidance (hats, staying cool) addresses the heat trigger. SPF is necessary but not sufficient.
"Melasma isn't stubborn because the treatment is wrong. It's stubborn because the trigger is internal."
Once you accept that melasma is a management condition — not a cure-and-done — you can build a realistic plan that actually works long-term.
What actually works for melasma
The approach is gentle, consistent, and long-term. No aggressive treatments. No expecting overnight results. The ingredients with the strongest melasma evidence are the ones that target the upstream signalling — not the downstream enzyme.
Tranexamic acid (TXA) — strongest melasma evidence
TXA blocks the plasmin pathway — the signalling cascade that hormones use to trigger melanocyte overproduction. Multiple RCTs show significant MASI score improvement at 2-5% topical concentration. Comparable efficacy to hydroquinone without the rebound or time limits. This is the single most important ingredient for melasma specifically.
Tinted SPF with iron oxide — daily, non-negotiable
Regular SPF blocks UV. Tinted SPF with iron oxide also blocks visible light — which is a documented melasma trigger that standard sunscreens miss. Apply every morning, reapply every 2 hours in sun exposure. This single habit change reduces melasma flare-ups more than any treatment.
Niacinamide + alpha-arbutin — supporting actives
Niacinamide blocks melanosome transfer (complementary pathway to TXA). Alpha-arbutin gently inhibits tyrosinase without irritation. Both are non-sensitising, which matters for melasma skin that's often already reactive. Together with TXA, they create 3-pathway coverage.
Heat avoidance — the overlooked trigger
Avoid hot yoga, saunas, steam rooms, and prolonged cooking over hot stoves. Wear a wide-brimmed hat outdoors. Park in shade. These behavioural changes reduce the heat-triggered component that topical treatments can't address. It sounds minor but it makes a measurable difference.
Your melasma management plan
The word is "management" — not treatment. This is a long-term routine, not a 12-week programme.
Daily — morning
- Gentle cleanser (fragrance-free)
- TXA-based brightening cream
- Tinted SPF 50+ with iron oxide
- Wide-brimmed hat if outdoors
Daily — evening
- Gentle cleanser
- TXA-based cream (second application)
- Moisturiser
The bottom line
Melasma is the one type of hyperpigmentation where you need to adjust your expectations. It's manageable — with TXA-based topicals, tinted SPF, heat avoidance, and patience — but it's not curable. The hormonal trigger is internal, and it may recur.
The biggest mistake is trying to treat melasma aggressively. Gentle, consistent, long-term care produces better results than aggressive treatments that trigger rebound darkening. Start with the plan above. Give it 12 weeks. If you need more, a dermatologist can add prescription options like azelaic acid or short-course hydroquinone on top of your daily routine.
Key takeaways
- Melasma is hormonally driven — fundamentally different from sun spots or PIH
- Laser and aggressive peels can make it worse — avoid as first-line treatments
- TXA has the strongest evidence for melasma — blocks the hormonal overproduction signal
- Tinted SPF with iron oxide blocks visible light — a trigger standard SPF misses
- Melasma is managed long-term, not cured — set expectations for ongoing care