Welcome to BYC! Please make yourself at home and we are here to help.
He might be molting. Or he has parasites. Or other chickens are pecking at him. Whatever the case, protein is very important. Foods with high protein content are very good to feed chickens missing feathers since feathers take up 85% protein! If he is bleeding, you need to isolate him from the rest of the flock so they don't bully him and make things worse.
Welcome to Backyard Chickens If the others are plucking out his feathers, maybe you could buy some no-pick lotion and give the other chickens some enrichment, like treat balls or extra free range time so that they won't be bored enough to pull his crest out.
Welcome to BYC and the coop! There's a lot of great peeps here! Feel free to ask lots of questions. But most of all, make yourself at home. I'm so glad you decided to joined the BYC family.
Good luck with your silkie!