PDT (PhotoDynamic Therapy) is a procedure that uses photosensitizing chemistry and very finely tuned light to selectively cleanse and disinfect your skin while stimulating its natural defenses against sun damage, acne and even pre-cancerous keratoses. Often it reverses aging and can even reduce scarring from severe acne. Our photosensitizing agent, Levulan® Kerastick® (aminolevulinic acid HCl) for Topical Solution, 20% (LEVULAN KERASTICK), plus illumination is indicated for the treatment of minimally to moderately thick actinic keratosis of the face or scalp. Actinic keratoses (AKs) are rough-textured, dry, scaly patches on the skin that can lead to skin cancer. It is important to treat AKs because there is no way to tell when or which lesions will progress to squamous cell carcinoma (SCC), the second most common form of skin cancer. So, now's the time to manage your damage!