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 4/14/2017
Updated by: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. 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.