What can be causing a circular red non-itching bumpy knuckle rash? Have had for many, many months, primary physician doesn t know what it is, has prescribed triamcinolone acetonide ointment, first 0.1%, now 0.5%. Seems to be working but very, very slowly. Each circular red splotch seems to be made up of a cluster of smaller bumps. Too bad I can t attach a photo.