What should you know about photo therapy for skin?

A clinician applies a light-sensitive medicine to the chosen area and allows it time to be absorbed. A specific light then activates the medicine, creating a reaction that damages targeted abnormal cells. It may be considered for some sun-related precancerous changes and selected skin cancers, including some Basal Cell Carcinoma cases. The exact medicine, light source, treatment area, and number of visits depend on the diagnosis and skin findings.

Tell the treating team about medicines, allergies, pregnancy, immune problems, and any condition that makes light exposure unsafe. Follow the clinic’s instructions about washing, creams, and sun avoidance. During the photosensitive period after treatment, protect treated and exposed skin from daylight and strong indoor light as instructed; ordinary sunscreen alone may not provide enough protection. Redness, warmth, swelling, crusting, or tenderness can occur while skin heals. Do not pick crusts or add active products without guidance.

Contact the treating clinic if pain is difficult to control, swelling spreads, the area develops worsening drainage, fever, or an unexpected reaction, or healing is not progressing as explained. Seek urgent care for breathing difficulty, facial swelling, or a severe allergic reaction. A new, changing, bleeding, or non-healing spot needs diagnostic review rather than cosmetic treatment.

Ask what diagnosis is being treated, why this light and medicine were selected, how long light precautions last, what healing should look like, and whether Topical 5-Fluorouracil or another option is suitable.