Have a red itchy skin rash on belly and arms?

Rash: Rashes are difficult to diagnose without being seen. Is it flat, pebbly, blistery? How long present? How large an area involved? Any contact with poison ivy personally or a pet? Any exposure to ticks? Any exposure to measles/chickenpox/etc? See pcp for evaluation & treatment of rash.

Rash: This can't be diagnosed with the information that is available. A history, physical examination & other studies may be needed to determine cause/causes. Once accurately assessed a treatment plan can be developed.