What to expect from photodynamic therapy for actinic keratosis

Actinic keratoses are sun-damaged patches that can feel rough or scaly. During photodynamic therapy, the clinician prepares the skin and applies a medicine that collects more readily in abnormal surface cells. A planned light exposure activates the medicine in the treatment area. You may notice warmth, stinging, or burning during illumination; tell the clinician if the sensation becomes difficult to tolerate so the session can be adjusted.

After treatment, redness and swelling can make the area look more inflamed before it settles. The skin may become tender, crusted, or flaky as the damaged cells clear. Healing differs by site, skin type, and the size of the area treated. Follow-up lets the clinician check the response and decide whether further treatment is needed.

Tell the clinic about medicines, skin products, previous light reactions, cold sores, and any condition that makes healing difficult. Arrive with clean skin unless the clinic gives different instructions. Plan to avoid strong indoor and outdoor light for the period your clinician specifies after treatment, because the medicine can leave treated skin unusually light-sensitive. Use the recommended covering and broad-spectrum sunscreen once advised, and do not pick crusts.

Gentle cleansing, a bland moisturiser, and cool compresses may make recovery more comfortable when approved by your clinician. Pause irritating exfoliants, retinoids, and fragranced products until the skin barrier has recovered. Keep the follow-up appointment even if the area looks improved.

Contact the treating clinic if pain is worsening rather than easing, redness is spreading, swelling is marked, or the area develops pus, a bad smell, or fever. Seek urgent medical help for facial swelling that affects breathing or vision, extensive blistering, or a severe reaction after treatment. A treated patch that continues to bleed, ulcerates, or changes after healing also needs review, because not every persistent rough spot responds to one session.

Ask which lesions will be treated, how long you must avoid bright light, what to apply during healing, and whether your medicines increase light sensitivity. You can also ask how the response will be assessed and what alternatives are suitable if a patch remains.