3 times the past week I have gotten a burning sensation that starts in my elbows and spreads over both arms, legs, and buttocks. Skin becomes inflamed and swollen. No changes in diet, detergent, or soap.

Skin changes. You may be reacting to some substance in food,medications,supplements. True swelling and inflammation of the skin would be a serious situation seen in cellulitis and would result in severe symptoms like fever and other signs of toxicity. Nevertheless these symptoms warrant investigation by a physician.