“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”. SKIN The Journal of Cutaneous Medicine 9, no. 6 (November 10, 2025): s684. Accessed April 17, 2026. https://skin.dermsquared.com/skin/article/view/3808.