I Have Had Chronic Hives On My Face And Neck,

I have had chronic hives on my face and neck, very burning and itching and will peel off for the last5months . Have had allergy test ,am now taking allergy shots for what it showed I was allergic to but doesn't seem to help any . Have had about 3 steroid injections since April and medrol dose packs . The first one kept it away for about. 2 months but the other two would only keep it away for about 2weeks! My Doctor has done test for autoimmune disease but it came back ok . Just not sure where to go next!