I Posted early in Jan about a rash on Gammagard. Internist sent me to Derm, my regular doctor wasn't available didn't think I needed a biopsy gave me an RX for cortisone cream, didn't help. Saw the Rheumatologist didn't know what was going on. He suggested a biopsy. Hematologist thinks it was Gammagard. He also suggested a biopsy. I went back to the Dermatologist and saw my regular doctor for a biopsy, came back as Lichen Simplex Chronicus and referred me back to Rheumatologist. Has anyone been diagnosed with Lichen Simplex Chronicus and what treatment did you receive?