I have really blotchy red skin, then little spots on the inside of my arms, and they really hurt when I even blow them, and it's really warm here.

Likely dermatitis. You probably have dermatitis. This is inflammation of the skin with itching or soreness, of various causes. The causes range from allergic to autoimmune. If the symptoms persists and cause significant pain or discomfort, you need to see your PCP for Dermatology referral.