A year ago my white Cochin bantam hen Marshmallow had Bumblefoot on the middle of both of her feet. I cured it. Now, her scars have opened up and there are scabs but I don't think it's Bumblefoot. Recently 3 other chickens got it. They are the oldest ones I have, they are 5, 5, and 3 years old. I think they are cutting themselves in the woods but mom thinks it's the roost and dad thinks we should disinfect the whole coop. What should I do?