When is excimer laser therapy recommended for hypopigmentation?

Hypopigmentation means an area of skin has less pigment than the surrounding skin. It can follow inflammation, injury, infection, or another skin condition, so diagnosis comes before treatment. Excimer therapy delivers a focused light beam to selected patches rather than treating the whole body. A dermatologist considers the cause, location, stability, skin tone, and whether the surrounding skin is also affected. The aim is to encourage pigment activity in suitable cases; colour matching can be gradual and may be incomplete.

Attend a skin assessment and mention recent tanning, medicines that increase light sensitivity, active irritation, and previous reactions to light treatment. Protect the area from ultraviolet exposure as advised and do not apply irritating products before a session unless instructed. Follow the planned schedule, photograph changes only under similar lighting, and report increasing redness, blistering, crusting, or persistent burning.

Contact the treating clinician if a patch changes quickly, becomes scaly, painful, itchy, or inflamed, or if treatment causes blistering or marked swelling. New widespread pigment loss also needs assessment because the underlying cause may require a different approach.

Ask what caused the hypopigmentation, why focused light is suitable, how normal pigment will be judged, and what skin reactions should be reported.