My partner was diagnosed with Vasculitis in Sept 2011, a day before he had resp failure and spent 3 mths in ICU on a ventilator after pulmonary hemmorhage. Recently we've been told he has WG anca neg. He's doing really well on 30mg pred reducing to 25mg and 50mg aza increasing to 100 next week. Yesterday, he discovered a painful hard lump behind one of his nipples. It's a little alarming but was wondering if any other WG sufferer's have experienced this, or could it be due to medication??