Advice please

Hi there I hope someone can give me some advice. I got a chicken family 2 weeks ago. It is a Silkie mom and dad and their 6 (adopted)chicks. The lady I got them from told me the Silkie rooster was picked on by her other roosters and some times falls over. So for the last two weeks he's been slow moving but otherwise hes alright, he's been eating and drinking. Well yesterday my son found him on his side and he couldn't get up. We brought him in and gave him some homemade electrolites he seemed a little better today so my daughter and I decided to bathe him and see if we could tell what's wrong. With him being wet we can now see his right wing is limp and upon inspection we see a small wound and there is tiny bugs around it. I'm not sure what to do next? Any advice?