nasty rash! HELP
ok this is the third time my son has woken up with a huge rash on his butt just from peeing overnight. couple weeks ago he woke up from a dirty diaper and had a rash and it started to spread but went away after a week. Then this morning he woke up crying and by the way he acted his butt was hurting so I changed his diaper (it was only wet) and this same rash is back and its bigger and but this time it had a blister in it. He didn't have a rash yesterday. it comes over night when he wets his diapers. what could it be from? hes not potty trained so its not like I can just tell him not to pee his pants. and he only breaks out on his butt below his junk.