One of my silkie hicks had a pasty butt and I cleaned it and cut some feathers off from back there. I also put vaseline on it's butt to help it poo. When I look at it's vent now it seems really dark and kind of swollen and it didn't look this way before. It's pooping just fine, am I just able to see it's little butt better because I put vaseline down there? Should I be worried?