I got my first ever chickens last year. I have never taken care of chickens before. My chickens have always been good and healthy and clean.... they just started laying eggs alittle over a week ago for the first time. At first the eggs were coming out clean and for the past couple days they have been more messy... I examined the chickens and found horrible stuff on their butts.... I am not sure what to do. Should I wash them and not worry? Is this a sign of illness? Please tell me what is going on and what I need to do about it!