Abdalla, Jennifer Elise, Allison Cruse, Neelam Patel, and Robert Brodell. “Terra Firma-Forme Dermatosis, Keratotic Form”. SKIN The Journal of Cutaneous Medicine 3, no. 3 (May 3, 2019): 212–214. Accessed October 5, 2022. https://www.jofskin.org/index.php/skin/article/view/396.