My chickens wounds are drying up. Where the skin is ripped off the flesh, the skin flap is turning black and dry, maggots are all gone. In working with the chicken "up close and personal" I see that there is a substance seemingly glued to the base of the feathers close to the skin. It is beige and hard about the size of a kernal of corn but flat. Does any know what this might be? Also this chicken has no feathers on her underbelly and around vent. Is this normal?