I have a pullet who is about 1 month old and I just noticed this morning the back of her neck just below her skull is bare and has a some swelling. It is not hot to the touch and fairly soft. Other than that she seems healthy running around & eating. Ther is a dark spot that looks like blood. I don't know if this is from the others pecking her. I have not seen any of them doing this. Could it be a spider bite?