Hi, my son is 4 years old,he will be 5 in September. He pees in the bed literally every night. Ive tired rewarding. This morning. He woke up with a red little rash on his belly, lower back, and the back of his left arm. What could this be? I m going to buy glow and the dark stars, every morning he wakes up dry, I m going to let him out a star on the ceiling for a reward. But what could the rash be and what causes it?