This happened about two weeks ago. It was itchy and irratiable. It has since peeled away but the darkness of where it was remains. I noticed it after a red bruise like scar appeared around my neck. It too has disappeared. I work with children and one them came in with the same dark crusty peeling on his lips. His mom said he had strep throat and that was just a reaction to the meds. Im not sure. Please help. I dont know if the doc can diagnose something that has gone away but I am curious as to what it could have been.