We have a 4-5 week old Silkie chick that has a large round lump on the back and some type of infection in his right eye. We have 10 silkie chicks and they are being raised as mainly pets in a nice back yard. Currently they stay in the garage and get lots of attention from the kids. They all seem to be doing great except one of our black ones. The chick seems a little smaller and may be a little lethargic but we are not sure. And after just looking at him/her again, the chick may be ruffling the feathers more. We live in Southern California, give them medicated chick starter feed, fresh water daily, a clean cage with plenty of room, heat lamp, and lots of attention. We are looking for answers on what this could be and if there is anything we can do. We started all the chicks on antibiotics in their water for precautionary reasons and have been applying Teramycin antibiotic ointment to the infected eye. Should we separate??? Which we tried but the kids couldn't handle the chicks constant cries. I do realize this may need to be done for the safety of the others. Oh and according to the kids (8, 5, and 2), the chicks name is ILY (Pronounced Eye-Lee) Thank you from the entire family.