My baby boy, 9months old, suddenly got a rash on his head today. it is red and blister like only in his hair. looks itchy. what clould it be?

Without seeing it: it will be difficult to diagnose for sure, but it could be eczema, a contact rash, or an infection. I would recommend that you have him seen by a doctor to be properly diagnosed and treated. If you have Prime on HealthTap, you could also consult with us that way, so we could actually see the rash.

Visual DX: Hi, it’s hard to say without a picture but there is a great app that may be able to help you get a diagnosis without being seen in person by a dermatologist. The app is called VisualDX and is one of the best, if not the best out there. Many clinicians, including myself, use it. Just snap a photo and it gives you a list of possible diagnoses. Good luck!