 [ Symptoms ] what would cause a healthy 6 year old girl to have a rash on her genitals that resembles diaper rash  she was with her father for the weekend and admitted she did not bathe for 4 days is the rash a result of not being clean or could it be something else  i have not seen this rash on her since she was potty trained at 3 [ Disease ] a contact dermatitis would be high on my list a sensitivity reaction to a detergent even if you have not changed detergents andor a dryer softener perfumed bounce for example even perfumed toilet paper can be a culprit i suspect her father uses different soaps detergents and may not have a washer that carefully rinses    guys are not very good at laundry of course not bathing could be contributory as well