I'm not sure what they tested for. They took a swab and a glass slide. They told me it was a bacterial infection. It doesn't look any worse this morning so that is good, I hope. The minute I take the cone off she's licking the site so no relief for her. I think I figured how she did it though. She likes to stuff her toy mousie under the closet door and really likes to get her paw under the door. She must have caught a corner in her armpit and ouchie after that.