LEVULAN KERASTICK and BLU-U® Photodynamic Therapy – Levulan Kerastick (aminolevulinic acid HCl) for Topical Solution, 20%, plus blue light illumination using the BLU-U® Blue Light Photodynamic Therapy Illuminator is indicated for the treatment of minimally to moderately thick actinic keratoses of the face or scalp.