what is welt rash?
Allergy is a common cause of a skin rash that appears as welts. Welts are raised, red or skin-colored blisters and lesions on your skin of varying shapes and sizes. If you have a full body rash characterized by welts, you may have hives. Allergies can produce hives, a condition that typically is not life-threatening; however, other symptoms of an allergic reaction can be fatal.