Sogliani, Davide, Chiara Mura, and Giorgio Tamborrini. “Successful Treatment of Idiopathic Knuckle Pads With a Combination of High-Dose Salicylic Acid and Urea Topical Keratolytics: A Case Report”. Dermatology Reports 13, no. 1 (April 13, 2021). Accessed June 23, 2021. https://www.pagepress.org/journals/index.php/dr/article/view/9072.