Best first aid for chickens: nustock - feed stores carry it but you can get it online as well. It is an old time sulphur based ointment. I've used it on puncture wounds and very bad deep gashes from hawk attacks, scaly leg mites, a ripped comb, and a torn toe. (all on chickens). I've also used powdered sulphur in a coconut oil base to make a salve. Ralphie, I never had bumblefoot in years of chicken keeping til I moved here - I think it is from the black berry brambles in part of the run- I used to be very vigilent and cut the foot, did out the core, express the pus, etc but I started thinking I was making it worse. Now, I don't do anything - just watch. If the foot is swollen and painful, I'll do a hot water/epson salt soak. Sometimes , very rarely, the infection will come to a point on the upper side of the foot, and then it is a hot water/epsom salt soak and the infection will pop out like a pimple - very gross - and then nustock on it, it heals up. With staph, you want to be careful yourself - gloves are a great idea as is practicing good disinfection. About 95% of the time, the chicken's immune system takes care of it. I think it is like any cut or injury - rarely will you need medical treatment, but if it starts getting systemic, then you or the chicken are in deep trouble.