It has been reported that some patients have been misdiagnosed with Allergic Contact Dermatitis, when in fact the correct diagnosis in their specific case was Angioedema.
Most cases of angioedema resolve in a few days without any treatment, but medication is often prescribed. Antihistamines and oral steroids are used to relive swelling. People with hereditary angioedema can benefit from treatment to prevent attacks. A physical examination as well as examining the welts or swelling can help on diagnosing angioedema. Blood or allergy tests are also often ordered.