I say muscle necrosis because in the histopath slides I have seen of baytril injection site reactions, muscle was the tissue involved. SubQ admin of Baytril is recommended over IM injection by most herp vets I know, and dilution with saline is recommended even for 22.7 mg/ml to help prevent necrosis. The problem is, even with these precautions necrosis still happens. That's why I prefer not to use this drug in snakes if the infection is susceptible to alternative antibiotics.