“Safety and Efficacy of Photodynamic Therapy with Aminolevulinic Acid 10% Topical Gel Activated by Red Light versus Aminolevulinic Acid 20% Topical Solution Activated by Blue Light for the Treatment of Actinic Keratosis on the Upper Extremities: A Blinded Randomized Study” (2025) SKIN The Journal of Cutaneous Medicine, 9(6), p. s684. doi:10.25251/9sm0xp66.