Post-inflammatory hyperpigmentation is seen here in a mottled pattern, over the posterior shoulder. Hemosiderin, left behind by degraded RBC's, creates the discoloration.
Review Date 4/16/2019
Updated by: Michael Lehrer, MD, Clinical Associate Professor, Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.