Hi, I also had that before when I was in high school. I never got treated for it, it kinda just went away on it's own. Is it really dry n scaled? Mine was, it was kind of like raised bumps everywhere. I did talk to my nurse about it at school she had said it was probably some type of bacterial infection. I noticed when I would get hot or sweat alot it made it worse, hope this helps.
It could be a yeast infection. Yes, you can get these on the skin in the areas you mentioned. If that's what it is your Dr will give you a cream for it. Take care. Remar
You should see your doctor right away. This sounds like Shingles to me. Shingles comes from the Herpes family, the same family as Chicken Pox. The doctor will treat it with antiviral medication if it's Shingles. Shingles will often burn and itch. It is really awful.