
A Retrospective Cohort Study and Clinical Classification System of Acne Keloidalis Nuchae
J Clin Aesthet Dermatol. 2021;14(4):E61–E67. by Sanusi Umar, MD; Delphine J. Lee, MD, PhD; and Jenna J. Lullo, MD Dr. Umar is with the Department of Medicine at the University