My chick had this from a racoon bite, i drained the scab and thank goodness I did, She was filled with maggots. I cleaned the wound gently and she did so good. I water cleaned gently daily and and 2 weeks later good. 7 months still with us!
Birds from places other than proffesional Breeders buy in large amounts that alot of times are not healthy. If you do what you are thinking of, i suggest keeping them seperate for a couple weeks. Just an opinion from a 15 year chicken breeder! Kindly JJ