Melasma & Pigmentation Treatment in Thrissur

The Light, Heat, and Skin Biology Behind Thrissur Melasma

Melasma, known locally as chloasma or the mask of pregnancy, is a chronic pattern of symmetrical brown to grey patches across the cheeks, forehead, upper lip, and chin. It is driven by light, hormones, and heat, and in Fitzpatrick IV-V skin the pigment cells respond strongly to all three.

Thrissur sits near 10 degrees north, so the sun stays high year-round. The pigment trigger in melasma is long-wave UVA (320 to 400 nm) and visible light, both of which scatter through the dense monsoon cloud deck while UVB is filtered out. That is why melasma keeps darkening from June to November even though the daily UV index drops from a pre-monsoon 11 to 12 down to 6 to 8. Patients read the lower number as safety, then flare.

Type IV and V skin, the norm in Central Kerala, carries high baseline melanin. That protects against UVB sunburn but makes melanocytes unusually reactive to UVA, so the same exposure that lightly tans fair skin can deepen a melasma patch here. Light is not the only driver. In the dense urban core around Swaraj Round, the heat-island effect keeps skin-surface temperature high, and pre-monsoon wet-bulb temperatures of 27.8 to 28.3°C mean that heat lingers on the skin. Heat alone stimulates pigment cells through heat-sensitive pathways, one reason melasma resists treatment that addresses only sun exposure.

For patients travelling in from Kodungallur and Chavakkad, sand and water reflect up to about 20% of incident UV back onto the face, an upward dose that a hat or a parasol does not stop. Reflected light is part of why coastal melasma often sits lower on the cheeks and jaw.

Dark underarms are a separate concern that brings many patients to DermaVue Thrissur. This axillary hyperpigmentation comes from friction, deodorant irritation, and shaving rather than sun, and it responds well to dermatologist-guided peels and topical brightening agents over six to eight weeks.