I have these tinny red bumps on my panty line and bra line. They start off as just a red patch of,skin that s really itch. Scratchin or not within a few days of the red patch tiny bumps start to for and become even more,itchy. They seem to so real when I scratch and seem to itch most when I am outside or in a hot bath.could it just be heat rash or is it,some,sort of,reaction?