21 year old female, with an itchy, blotchy, rash which started on my neck, and has spread to my chest and down my back, but it's not all connected, there are separate blotchy oval shaped rashes. I've noticed that higher temperatures cause it to be worse as does the warm water in the shower. I'm fair skinned and haven't really been in the sun this year, or near any kind of plants that could cause an itchy rash.