A few days ago my cat a had what seemed to be a rash on her chin. Later her lip swelled up. I went to the vet yesterday and he said it was a rodent ulcer. The day before the rash, i saw her playing with some bugs. I asked the vet if it could be caused by fleas and he said it's not likely. My cats not on flea treatment because she's an indoor cat, but decided to buy Revolution to get her started. The vet gave her a shot of depo medrol 20mg and 10ml of the Convenia shot yesterday. I did't really know the horror stories of Convenia untill today. My cat was a bit a hyper after her visit and she hasn't really ate that much. The good news is her swelling has gone down. Are there alternatives to Convenia and is it as bad as everyone has said on the internet.