You said your chameleon got another mouth infection...did the vet clean it out the last time he had it? This time? Or did he/she just put it on meds? Was there any culture and sensitivity test done? What medication is it on? Last time?

You said your chameleon has a problem with one eye before but now seems to have a problem with the other one...is the eye on the same side as the mouth infection? Is the infection in the same place as the last time?

Re: the arm problem...I've never had this happen with any chameleon that I've had to give injections to. I don't know if hitting the bone when the injection would cause this or not? I can only suggest that you mention it to the vet.