I have a small (dime size) red area, itchy,slightly raised on my chest. This is the second one I have had in the last 6 months but in a different area of my chest. The first one was closer to my collar bone. It eventually went away but left a slightly brown stain in the skin it affected. I am a 53 yr old female. No topical otc stuff is making it better. Any ideas on what it could be? I am not on medication except Imitrex as needed for migraines for the last 12 yrs.