TY - CHAP M1 - Book, Section TI - Ingrown Toenail (Onychocryptosis) A1 - Ritter, Kathryn A1 - Fitch, Robert Warne A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason Y1 - 2021 N1 - T2 - The Atlas of Emergency Medicine, 5e AB - Ingrown toenail occurs from impingement and puncture of the medial or lateral nail fold epithelium by the nail plate, allowing growth into the dermis. Granulation tissue causes sharp pain, erythema, and further swelling. The granulation tissue may become epithelialized, preventing elevation of the nail above the nail groove. There is often secondary bacterial or fungal infection. Risk factors include cutting nails short, tightly fitting shoes, and trauma. Differential includes paronychia, felon, and tumor. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/03/28 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181043521 ER -