I just got two of my 6-month-old kittens spayed the past Wednesday. They have been doing fine besides not being comfortable with the E. collar since they have never worn a collar before. However, I found on one of my cats that her surgical site grew a bit looks like a lump or bump as shown in the pictures. She doesn't seem to have anything different other than being quieter than usual and sleeping more. The other cat doesn't have that obvious bump. When I gently touched that bump, the top center is like hard white crusting, the side is soft. I know they are not able to leak themselves, so I wonder if it is a good thing. I checked on the vet web and said it could be due to too much exercise, and this cat is definitely jumpy. The first day I brought her back, she just kept moving around as if she did not just have surgery. She finally got used to wearing E collar and calmed down now, but then I saw this lumpish thing. What should I do? On the website, it says it usually goes away in a couple of days as it grows larger first and then smaller until it disappears. Should I wait for 2-3 days to see if it gets smaller or should I go to an emergency vet directly? I am not too worried as she is doing fine but just got a little bit concerned about the change.