My daughter has a pimply rash on her stomach. Moshe says it's itchy. Looks like small bumps, almost like whiteheads?

Rash. heat rash, viral/ allergic rash can give small bumpy rash. If there are white heads it may be folliculitis. Need to see your daughter's physician.
See your doctor. Rashes are tough to diagnose without seeing them. You should take your daughter to her doctor for the proper diagnosis. If she has a fever, it could be a viral infection or even secondary to strep. It also could be a reaction from something she was exposed to or ingested.