Hi!
First let me say I'm not a doctor, just another parent who has an interest in Dermatological things.
My first thought is maybe scabies? It's a scary thing to think about but actually very easy to catch. It causes hive like bumps and severe itchiness, and usually there are telltale marks between fingers. My family has had personal experience when a brother brought it home to myself and my 2 other brothers. We didn't know what it was until they looked at him and did a test for it. It just required a simple cream to clear it up, but until they figured out what it was I experienced the worst itching of my life and it did keep me up nightly.
Have you thought about asking the doctors about anything like body lice/scabies?
Always check with a doctor of course. Here on MH we have an "Ask an Expert" forum with a dermatology section so feel free to check it out.
sincerely,
Cindie
Martikadragoon (CL Dermatology)
Hello,
Itchy rashes which involve the whole body are often due to viral infections and allergic reaction. Since the rash has been present for some days without any change, so it can be due to allergies or any other skin manifestation rather than viral reaction which peak up after some days and then goes away.
I suggest you to get your child evaluated immediately from a pediatrician.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. Treatment can be started only when the diagnosis is confirmed. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.