Safety and Efficacy of Photodynamic Therapy with ALA 10% Topical Gel Activated by Red Light versus ALA 20% Topical Solution Activated by Blue Light for the Treatment of Actinic Keratosis on the Upper Extremities: A Blinded Randomized Study . J of Skin [Internet]. 2024 Nov. 18 [cited 2026 Apr. 30];8(6):s485. Available from: https://skin.dermsquared.com/skin/article/view/3060