What is this rash?
Oh no, your child has a rash on their hand, what is it?
First think about what the rash looks like. Is it blisters? Bumps? Red spots?
Lots of things can cause a rash from an allergic reaction to bug bites to sun burn. Try to figure out what the trigger might have been. If it looks like bug bites treat it with anti itch cream. Poison ivy? Try calamine lotion. Hives? An antihistamine should help.
If the rash doesn't go away or spreads even with home treatment go tot he doctor.