Does the skin rash blanch if your baby has diaper rash?

Yes.: Diaper dermatitis will usually blanch when you press on it; it's a sign that the skin is inflamed, and the little tiny blood vessels in it have dilated to bring more blood to the area. The fastest treatment for diaper dermatitis is to take off the diaper. While that may mean somebody will have to follow the baby around with a pooper scooper, the rash will clear very quickly.