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.

Related Questions

Stomach pain, acid stomach, brown and red itchy skin rashes, everytime I eat something with acid it will bother me at night during my sleep. Help!

See your doctor. It looks like you have 2 problems, stomach pain and skin rashes. You might have acid reflux / gastritis or peptic ulcer diseases. You can try otc antacid or acid reduction meds like zantac (ranitidine) in the meantime but you need to be seen and evaluated to have it treated correctly. Also it's almost impossible to know what your skin rashes might be if we don't see it. Your local doctor can help. Read more...