Melasma from sun exposure: understanding the link

Ultraviolet radiation can activate pigment-producing cells, while visible light may also contribute to persistent facial discolouration in some people. The forehead, cheeks, nose and upper lip receive frequent exposure, including during ordinary travel or time near windows. Heat may add another trigger. Melasma often appears as flat, irregular brown or grey-brown patches rather than a rough rash. A pattern that is scaly, raised, bleeding or rapidly changing should not be labelled melasma without an examination.

Apply broad-spectrum sunscreen to exposed skin and follow the product directions for reapplication. A wide-brimmed hat, shade and sunglasses can provide practical support when outdoors. Do not wait for a beach day: regular incidental exposure can matter. Use gentle products and stop anything that burns or causes peeling. If colour persists, a dermatologist may combine trigger control with a prescription routine or a carefully chosen chemical peel, microneedling, skin brightening treatment or laser toning. Heat exposure and post-procedure sun protection should be discussed before treatment.

Arrange an assessment for new facial pigmentation that does not have a typical flat, symmetric pattern, or for a patch that continues changing despite protection. Seek prompt review for bleeding, crusting, pain, marked itch, a persistent sore or a raised lesion. Sun exposure can cause several skin changes, and accurate identification guides safe care.

Ask whether the pattern is melasma or another sun-related change, whether visible-light protection would help your skin, and how to choose a sunscreen you can use consistently. Discuss heat triggers, suitable treatments, aftercare and the signs that should prompt an earlier review.