My male ribbon snake developed 3 lumps on his left side about 3 inches from his tail, one barely visible. At first I thought they were blisters. I have been swabbing them twice daily with hydrogen peroxide for about a week, and the larger lump has decreased in size. Two days ago another lump appeared closer the his tail. His enclosure is dry and I haven't noticed him in the water, so I don't know if they are really blisters or some sort of bacterial infection.