It is an in-office procedure in which a topical solution called Ameluz (aminolevulinic acid HCl gel) or (Levulan® Kerastick) is applied to the skin, then later activated by a light source in order to target precancerous cells. The PDT reaction is activated by a red or blue light source. PDT can be used to treat precancerous spots and sun damage on many areas of the body such as the face, scalp, chest, arms, and legs. Although a single PDT treatment may yield excellent results, photodynamic therapy is best completed as a series of treatments.
Photodynamic therapy needs to be thoughtfully scheduled because it has downtime. Patients must remain indoors away from sun exposure and bright light sources for 48 hours following the procedure. The skin may peel or be red for approximately 7-10 days after PDT treatment. PDT without use of the topical medication is called BLU-U therapy. It can be used to target acne and excess oil production.