Hi. 5 days ago my dog had an impacted anal sac drained and packed with ointment and she is on clavamax and baytril. There is some lessening of the infection but there is still a hard mass above the left anal sac that extends up onto her rear next to the top of her tail. You can't see much so a picture won't help. You can just feel it. It's also quite painful for her if I touch that area.
I'm concerned that it's a tumor. My vet said it may just be scar tissue. How do you know the difference? Thank you for your help.

