That happens to me and my daughter all the time. It's an allergic reaction to something you ate or touched. If I touch lavender or pineapple I get it, also if I take penicillin or eat fish. I don't know if you can take the benadryl cream but I was told not to take the pills by my doctor. I hope you can figure out what caused it so you know to avoid it in the future.
No only on my hands. The burning is not as strong but they are still red.
You haven't noticed the rash anywhere else? Feet or mouth?
Sounds like you are having an allergic reaction to something. I would take some benadryl and if it doesnt go away or if it gets worse call your doctor. Hope u feel better soon!