Blue-light photodynamic therapy: what to know

A clinician applies a photosensitising medicine to the target area and allows it to absorb into suitable abnormal cells. Blue light then activates the medicine, producing a local reaction intended to damage those cells. The exact preparation, light exposure, and number of treatment visits depend on the diagnosis, site, and medicine used.

Photodynamic Therapy may be considered for selected sun-damaged lesions and some superficial skin cancers. It is not appropriate for every suspicious mark, and a biopsy or alternative treatment may be needed. Basal Cell Carcinoma requires a treatment choice based on its depth, location, and other clinical features.

Tell the clinician about medicines that increase light sensitivity, previous reactions to light, pregnancy or breastfeeding, and any infection or open wound at the site. Follow the clinic's instructions about washing, shaving, and arriving without irritating products.

After activation, the area may sting, redden, swell, crust, or peel as it heals. Keep the site protected from bright indoor and outdoor light for the period advised by your clinician, and use only recommended dressings or products. Do not pick crusts. Topical 5-Fluorouracil is a different treatment and should not be substituted without medical advice.

Call the treating team if pain is difficult to control, swelling keeps increasing, the wound produces pus, fever develops, or healing appears to stop. Seek urgent help for facial swelling with breathing trouble or a serious eye symptom. Report a lesion that returns or changes after treatment so it can be reassessed.

What exactly are we treating, and is tissue sampling needed? Which medicine and light will be used? How long must I avoid bright light? What wound care should I follow? What alternative would you recommend if this treatment is unsuitable?