Photodynamic Therapy For Treating Precancers Levulan® Kerastick® (aminolevulinic acid HCl) for Topical Solution, 20% (LEVULAN KERASTICK) plus blue light illumination using the BLU-U® Blue Light Photodynamic Therapy Illuminator (LEVULAN KERASTICK and BLU-U PDT) 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...