I've got a rash
A man goes to the doctor and says "Doctor, I've got a rash round my cock, have you got anything for it?"
The doctor said "Put this on and come back next week if it doesn't work."
The man comes back the next week and the cream hadn't worked, so he tells the doctor. The doctor gives him more cream and tells him to come back next week if it doesn't work. The man comes back and the cream still hasn't worked, so the doctor says "Drop your pants."
The man drops his pants and the doctor has a look and tells him to put another cream on. The man then says "Doctor it's worked!! What was that?"
The doctor replies "Lipstick remover"