swelling injury?

[TreeRiver]

New here. Would love some advice on the cause/treatment for the 6- week old chick on the right. There looks to be an injury and swelling where we would expect the comb to come in. Thanks!

 

[Sylver Queen]

Hi. If you add info about what is swollen and just what the chick needs help with, it will help the wise folks at BYC know better how to advise. I don't have much experience with this, but others do. : )

 

[TreeRiver]

I added a bit of info above. We did introduce a rooster about 3-4 weeks older to our flock of 20 chicks a week ago. There was a bit of pecking involved, but nothing that seemed severe.