What Is The Treatment For Blisters On The Skin?

Had first xolair injection. Day 4 there was a rapid onset of blisters on my breasts.there were many but 4 had eropted. Open sores. I immediately took 3 benedyl and again in 3 hours. The rest went away but the burst ones still persist 2 weeks later. Called Dr immediately she thought e multiple. Was sent to skin Dr day 7 she was unsure and mad because to late for biopsy. I a m 59 year old woman with severe allergic asthma. This drug was the last hope before oxygen and bed ridde . within hours of the shot my breathing was almost perfect. I don t want to give up. Please give me some hope.