The condition often goes away by itself, though it may hang around for a while. Dermatologists use cortisone creams, or injections of cortisone. In my expreience, these don't work all that well. A cortisone-containing tape (
CordranCordran
Cordran sp
Cordran tape tape) may help flatten lesions. Sometimes, though, the best thing to do is wait.
Best.
Dr. Rockoff