Need some help! I have a 6 mo. lavender orpington roo that has blackened areas on his comb, bald spots on his head below the comb and a really raw butt. I looked at the butt after I noticed his feathers below his tail were all wet. The blackened spots on his comb have been there a while but noticed the bald area last night and then the wet feathers this morning. He's drinking water profusely and looks pretty skinny, but I haven't noticed any diarrhea or bloody poop. I have him isolated now, but don't know what to do next. Appreciate any advice.