My RI Red hen has small black clumps on her comb and she smells strange. Kind of sour. Thought it might be dirt on her comb, but it didn't come off easily. Scabs maybe? I haven't seen her pecked at all, and she's eating and running around and laying just fine. Nothing unusual about her crop that i can see. Smell is grossing me out and worrying me a bit, though. Thoughts?