Left arm just on the top side from my bicep and all down to my fingers sore to touch feels like sunburn, also in shoulder blade, under armpit, arm aching?

Possible allergy. The description of left arm shoulder blade and armpit , aching s-like sunburn aching suggests that it may be either allergic reaction to prolonged exposure to sun ,poison ivy or some infection is coming up ..See your doctor ,get examined and treatment .In the meantime you apply hydrocortisone ointment to left arm.

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