I am 32 weeks pregnant with twins. I've had rash like symtoms between my legs - inner thighs by my vagina. I've gained alot weight and my thighs rub together, so i thought the added moisture and rubbing caused it. however, now it has turned into something that look more like boils...big red bumps. and they seem to be swelling. my doctor has not looked at them, but has said that he thinks its just a rash caused by extra blood flow and moisture. what do you think it is? is this common?