That looks like the same problem my rooster went through. I just kept an eye on him, and it fell off after a few weeks, and he’s doing alright now, so I would just keep an eye out for your little baby for now.
How do I sex my 4- 6 week old chicks? I have my suspicious chick here (this one is a 6 week half Bufforp half black australorp) also the chick in the pic is somehow black and white??