Nazarian, Roya S., Nikki Vyas, Noah Scheinfeld, and Robert G. Phelps. 2019. “Bilateral Porokeratosis Ptychotropica on the Gluteal Cleft: A Case Report and Review of the Literature”. SKIN The Journal of Cutaneous Medicine 3 (6):427-30. https://doi.org/10.25251/skin.3.6.11.