Yup, so as the thread title suggests, my 2 year old boy has a rash on his bum-bum and thighs ...

It's not evenly spread, they are little raised red lumps ... they don't hurt or itch, and he has no other symptoms (no fever, vomiting, lethargy, nothing ...).

I'm guessing heat rash, or an irritation to something ...

Any other thoughts?