I have a Welsommer 3 wks old who is not growing like the others. And today I noticed it has a strange growth on its head, there are a few feathers growing out of it. The chick is eatting and drinking, but seems to be growing slow. Any idea's what it could be, I'm thinking of tyeing a string around the base of the growth to cut off the blood supply to it. The other chicks have picked it but not to the point where its bleeding, but I know I should do something before they get to that point.