The mechanism in plain terms
Your skin contains pigment-producing cells called melanocytes. Oestrogen and progesterone make these cells more sensitive to stimulation, and melanocyte-stimulating hormone rises through pregnancy. The cells then respond to any trigger — sun, heat, friction, inflammation — by dumping far more pigment than usual into the surrounding skin. Because the stimulus is hormonal and widespread, the result is symmetrical patches rather than isolated spots.
Melasma sits in one of two depths. Epidermal melasma is shallow, looks well-defined and brown, and responds reasonably well to treatment. Dermal melasma sits deeper, looks bluish-grey with blurred edges, and is far more stubborn. Many people have a mix of both.
Why Indian skin is more susceptible
Skin types IV to VI have larger, more active melanocytes that respond strongly to stimulation. Add high year-round UV index across most of India, long commutes, and cooking over open heat, and the triggers are relentless. Studies consistently place melasma prevalence among pregnant Indian women far above global averages, and a family history raises the odds further.
The triggers you can control
- Ultraviolet light — the strongest driver, and active even on overcast monsoon days.
- Visible light — blue and violet light also stimulate pigment in darker skin, which is why clear chemical sunscreens underperform. Tinted formulas containing iron oxides block it.
- Heat — standing over a gas stove or tawa raises skin temperature enough to trigger pigment. Use the back burner and a chimney or exhaust fan.
- Friction and irritation — aggressive scrubs, threading, waxing the upper lip and harsh home remedies like lemon juice all cause post-inflammatory darkening on top of the melasma.
- Fragranced products — some cause phototoxic reactions that deepen patches.
What is safe to do while pregnant
Sun protection, first and always: a mineral or tinted sunscreen at SPF 30 or higher, reapplied every three hours of daylight exposure, plus a wide-brimmed hat or umbrella. Azelaic acid and vitamin C are generally considered safe in pregnancy and gently reduce pigment production. Niacinamide helps limit pigment transfer.
Hydroquinone, retinoids, chemical peels and laser treatment are postponed until after delivery and, if you are nursing, discussed with your doctor first. Aggressive treatment during pregnancy tends to inflame the skin and worsen the patches.
What to expect afterwards
Once hormones normalise, melasma usually lightens substantially over six to twelve months. It does recur with sun exposure, combined oral contraceptives and subsequent pregnancies, so sun habits built now pay off for years.