Even thought Lucee is a dog, the same thing happened to her. Looked like 3 marbles in her scar area. I took her in and they said infection, but not too bad, because there was no leaking. She was having a reaction to the inner stitches, as glue was used on the out side, not stitches. She went on meds for 14 days, still on for one more day I think, and by the end of the first day the redness was gone. And now the marbles are gone too. Everyone said it was normal, but I HAD to take her to the vet, $85.00 more Which I didn't have, but when it comes to the kids, I always say it doesn't matter what it cost, just fix um up !!!
Glad to hear Mandy is on the mend too