Since yesterday my deltoids and half of my chest is red, it looks like a sunburn but I havn't been exposed to sun. Yesterday I used a corticoids ointment and it went away but came again, today after a cold shower it went away again but its slowly coming back. It doesn't itch at all but it has a small burning sensation (just like when you get sun burned) I havn't used any new shampoo or ate anything different from usual. I'm totally lost, what do you think this might be?