RT Book, Section A1 Ritter, Kathryn A1 Fitch, Robert Warne A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181043480 T1 Felon T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181043480 RD 2024/03/28 AB A felon is a distal digital pulp space pyogenic infection. Pus collects in spaces formed by the vertical septa anchoring the pad to the distal phalanx. It is characterized by severe pain, exquisite tenderness, erythema, and tense swelling of the distal digit. Visible pus or palpable fluctuance may be present. Complications include deep ischemic necrosis, osteomyelitis, septic arthritis, and suppurative tenosynovitis. The differential includes paronychia, herpetic whitlow, and traumatic hematoma.