Warning: gross picture. My Brahma hen (1 1/2 years old) was going through a molt, so looking pretty ragged. No bald spots, but lots of missing feathers and pinfeathers. So I kind of left her alone. About three weeks ago, I picked her up and noticed she smelled bad. So I flipped her over and there was a big mat of grossness around her vent, so I cut it all off. She's been acting fine. Today I noticed she was missing tail feathers and the puff of feathers above her tail looked odd (Brahmas have a lot of fluff there). So I picked her up and she smelled really bad. I felt a mass almost the size of a tennis ball there, above her tail. Infected preening gland? I brought her in and washed her thoroughly with Dawn, pulled off a large scab and poured Hydrogen Peroxide all over it. It looks horrible and infected. She's in the house in a cage now. Of course it's Saturday night, so no vets are open tomorrow. Anybody ever seen anything like this before? Any suggestions before tomorrow?