Pityriasis circinata

Your skin is your body's largest organ. It covers and protects your body. Your skinHolds body fluids in, preventing dehydrationKeeps harmful microbes out, preventing infectionsHelps you feel things like heat, cold, and painKeeps your body temperature evenMakes vitamin D when the sun shines on itAnything that irritates, clogs, or inflames your skin can cause symptoms such as redness, swelling, burning, and itching. Allergies, irritants, your genetic makeup, and certain diseases and immune system problems can cause rashes, hives, and other skin conditions. Many skin problems, such as acne, also affect your appearance.NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases