Melasma is an acquired hyperpigmentation disorder in which patches of brown or grey-brown skin appear symmetrically on sun-exposed areas of the face, most often the cheeks, forehead, upper lip (the moustache distribution that gives the lay name pregnancy moustache), nose and chin. The pigment is excess melanin produced by overactive melanocytes, and the patches typically have irregular borders and merge gradually into the surrounding skin rather than ending sharply.

Melasma is overwhelmingly common in Indian pregnant women: 50 to 70 percent develop visible melasma during pregnancy, compared with 10 to 30 percent in lighter-skinned populations. The condition is not painful, not itchy, and not dangerous, but it is cosmetically distressing and can significantly affect self-image. Melasma in pregnancy is called chloasma or the pregnancy mask, but the same condition can occur outside pregnancy in women on hormonal contraception or with hormonal fluctuations.

Indian skin sits in the Fitzpatrick III to V range, which means significantly more baseline melanin than European skin and significantly more responsive melanocytes. When the melanocyte-stimulating triggers of pregnancy (oestrogen, progesterone and melanocyte-stimulating hormone all rise sharply) act on these already-active melanocytes, the pigment response is much larger and the resulting melasma is more visible and more persistent than in lighter skin.

The Indian UV environment compounds this. India sits at low latitudes with a high UV index for most of the year, and even monsoon and winter days carry meaningful UV radiation. UV light directly stimulates melanocytes and is the single biggest external trigger for melasma, and the combination of responsive skin plus heavy UV exposure plus pregnancy hormones is why Indian women see melasma at much higher rates than Western data suggests.

Visible light (not just UV) also stimulates pigmentation in Indian skin, which is why ordinary sunscreens that block only UV are not enough — the iron oxide tints in dermatologist-recommended Indian sunscreens block visible light too, and this matters more for Fitzpatrick IV and V skin than for lighter tones.

Melasma in pregnancy typically becomes visible in the second trimester, from around weeks 14 to 20, as oestrogen and progesterone reach the levels at which the melanocyte stimulation becomes clinically apparent. Some women notice subtle darkening from late first trimester, and a small proportion see significant melasma only in the third trimester. The pigmentation usually deepens through the rest of pregnancy and is at its most prominent in the last weeks before delivery.

The distribution pattern is recognisable and symmetric. The centrofacial pattern is the commonest, with patches across the forehead, cheeks, nose, upper lip and chin. The malar pattern affects only the cheeks. The mandibular pattern affects the jawline. The forearms can also be affected in some women. The linea nigra (the dark vertical line down the abdomen) is a related pregnancy pigmentation but is not technically melasma.

The symmetry is one of the diagnostic features that distinguishes melasma from other pigmentation conditions, and the typical sparing of the area under the nose (the protected zone) is another clue. A dermatologist can confirm the diagnosis clinically without needing biopsy or special tests in almost all cases.

Sun exposure is the single most important trigger for melasma at every stage and in every context, and even melasma that started in pregnancy will worsen and persist if sun protection is not strict. UV-A, UV-B and visible light all stimulate melanocytes, and even brief unprotected exposure during a daily commute or kitchen window time is enough to maintain melasma. The hormonal triggers extend beyond pregnancy to combined oral contraceptive pills (OCPs), hormone replacement therapy in perimenopause, and hormonal IUDs in some women.

Heat is an under-recognised trigger that matters particularly in the Indian context. The infrared radiation and physical heat from cooking stoves (chai-making at the gas hob is a classic Indian melasma trigger), tandoors and outdoor work in summer all stimulate melanocytes independently of UV light, and women with melasma should be aware of this and minimise stove-side exposure or wear a tinted sunscreen even when not in direct sunlight.

Other triggers include some cosmetics and skincare products (especially those with fragrances or photosensitising ingredients), some medications including phototoxic drugs and anti-epileptics, thyroid dysfunction, and chronic emotional stress. Identifying and addressing the individual trigger combination is part of long-term management.

During pregnancy the foundation of melasma management is daily broad-spectrum sunscreen of SPF 50 or higher, applied generously in the morning and reapplied every 3 hours during the day if outdoors. This is the single most effective and most evidence-based intervention available, and without it nothing else works. Trusted Indian brands suitable in pregnancy include Aqualogica Detan SPF 50 (around 400 to 700 rupees), Re'equil Oxybenzone-Free Sunscreen SPF 50 (around 500 to 800 rupees), Minimalist Sunscreen SPF 50 (around 300 to 500 rupees) and La Shield SPF 40 PA+++ (around 600 to 900 rupees).

Tinted sunscreens containing iron oxides are particularly recommended for Indian skin because they block visible light in addition to UV, and the visible light protection is meaningful for Fitzpatrick IV and V skin where melasma is more pigment-responsive. Mineral sunscreens with zinc oxide and titanium dioxide are preferred in pregnancy over chemical filters because the physical filters sit on the skin surface and have no systemic absorption concerns.

Application matters as much as choice. The standard adult face needs around two finger-lengths of sunscreen for adequate coverage, applied 15 minutes before sun exposure and reapplied every 2 to 3 hours outdoors. A wide-brimmed hat sunglasses and shade-seeking complement the sunscreen and together form a comprehensive sun protection package.

Several effective melasma treatments used outside pregnancy are not safe in pregnancy and must be avoided. Hydroquinone (sold as Melalite, Eukroma and others) is the most effective topical depigmenting agent but is FDA Category C and is generally avoided during pregnancy because of systemic absorption concerns and uncertain fetal safety. Retinoids and tretinoin (Retin-A, Retino-A, A-Ret) are FDA Category X (oral) and Category C (topical) and must be avoided in pregnancy because oral retinoids cause severe birth defects and the topical caution is genuine.

Salicylic acid above 2 percent (chemical peels, strong acne treatments) is best avoided in pregnancy in the higher concentrations, although low-concentration leave-on products are generally considered acceptable. Chemical peels including glycolic, lactic and TCA peels are best deferred until after pregnancy and breastfeeding because of pigmentation rebound risks and systemic absorption uncertainty.

Energy-based treatments including IPL (intense pulsed light), Q-switched lasers, picosecond lasers and fractional lasers are not recommended during pregnancy. The combination of melanocyte hyperactivity and uncertain laser-fetal safety means dermatologists routinely defer all laser treatment until at least 3 to 6 months postpartum and after breastfeeding has stabilised.

Three topical ingredients have a good safety record in pregnancy and meaningful evidence for melasma. Azelaic acid 15 to 20 percent is the strongest pregnancy-safe option for melasma — it inhibits tyrosinase (the key enzyme in melanin production), has anti-inflammatory effects, and is FDA Category B (no fetal risk in animal studies). Indian options include Aziderm 10 or 20 percent cream (around 250 to 400 rupees) applied once or twice daily to affected areas. Mild stinging is common in the first week and usually settles.

Vitamin C (L-ascorbic acid) 10 to 15 percent serum is the second pregnancy-safe option, working as an antioxidant and a mild tyrosinase inhibitor. Indian options include Minimalist Vitamin C 10 percent (around 600 rupees), Plum 15 percent Vitamin C, and Dot and Key serums. Apply in the morning under sunscreen for additive UV-protective and brightening effects.

Niacinamide 5 to 10 percent is the third safe option, which reduces the transfer of melanin from melanocytes to skin cells and has a complementary mechanism. Re'equil 10 percent Niacinamide (around 500 rupees), Plum 5 percent Niacinamide and The Ordinary Niacinamide are commonly used in the Indian market. These three can be combined under sunscreen during pregnancy and form the realistic in-pregnancy treatment toolkit.

After delivery and (in most cases) after breastfeeding has stopped or is well-established, the full dermatology toolkit for melasma becomes available. The dermatologist-prescribed first-line is usually triple-combination therapy with hydroquinone 2 to 4 percent (Melalite, Eukroma — around 200 to 400 rupees), a topical retinoid like tretinoin 0.025 to 0.05 percent, and a mild topical steroid in a short course of 8 to 12 weeks. This is the gold-standard Kligman formula and gives 50 to 80 percent improvement in most patients.

Other postpartum options include kojic acid 1 to 2 percent (a fungal-derived tyrosinase inhibitor), oral tranexamic acid 250 mg twice daily for 8 to 12 weeks under dermatology supervision (effective for resistant melasma with a good Indian evidence base), topical tranexamic acid 5 percent, and superficial chemical peels including glycolic acid 20 to 35 percent and lactic acid peels done at intervals of 2 to 4 weeks.

Laser and energy-based treatments include low-fluence Q-switched Nd:YAG laser (toning), picosecond lasers and fractional non-ablative lasers, all of which require expert dermatology hands in Indian skin because the pigment-stimulating risk is real. Apollo Dermatology, Kaya Clinic, Olivia Clinic and Oliva Skin and Hair Clinic offer melasma packages typically ranging from 500 to 2000 rupees per consultation and 2000 to 10000 rupees per laser session.

Daily habits make the single biggest difference to melasma outcomes and matter more than any individual treatment product. A wide-brimmed hat (broad-rimmed cotton or straw hat with at least 7 to 10 centimetre brim) and UV-blocking sunglasses are essential outdoor wear, and the brim and glasses cover the central face areas where melasma is concentrated. A light cotton dupatta drawn over the face during long outdoor exposure adds genuine UV protection too.

Time-of-day choices matter. Avoiding direct sun exposure between 11 am and 3 pm (peak UV hours in India) reduces melasma stimulation significantly, and shifting outdoor walks to early morning or evening is a sensible adaptation. When outdoor exposure is unavoidable, reapply sunscreen every 2 to 3 hours rather than relying on the morning application, because sweat and rubbing remove sunscreen faster than most women realise.

Indoor sources of heat and visible light are easy to overlook. Chai-stove proximity in the kitchen (the radiant heat from gas stoves stimulates melasma), prolonged screen time (visible light from devices) and bright halogen or LED lighting all add to the pigment stimulus. A tinted iron-oxide sunscreen worn even indoors during long cooking or screen sessions is a worthwhile habit for women with active melasma.

Setting realistic expectations is important because unrealistic expectations drive disappointment and risky treatment choices. Pregnancy melasma often improves spontaneously in the 6 to 12 months after delivery as hormone levels normalise, and around half of women see meaningful natural lightening in this window without any active treatment, provided sun protection is strict. The other half continue to have visible melasma that needs dermatology input.

The realistic best-case outcome with the full dermatology toolkit is 50 to 80 percent improvement in pigmentation over 3 to 6 months of treatment, not complete clearance. Melasma has a strong tendency to recur, particularly with sun exposure, hormonal contraception or further pregnancies, and complete permanent clearance is uncommon. The honest framing is to aim for substantial improvement and good ongoing control rather than a one-time cure.

Maintenance is part of the picture. Even after good initial improvement, ongoing daily sunscreen, periodic dermatology review and sometimes maintenance topicals are needed to keep the melasma quiet. Women who can accept this longer-term perspective do well; women who expect a single magic treatment usually feel let down and risk going to unregulated clinics that promise more than they can deliver.