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My 4-month kitten has a pus-filled lip bump. Is it from nursing mom?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 3 months and 15 days old

My male kitten has a bump on his lower lip that looks like it's filled with pus. He didn't have it until after nursing on his mother who is in heat. He is about 4 months old and usually doesnt nurse unless he is sleeping with his mother. I noticed the bump right after I took him away from nursing on his mother. The mother previously had swollen breasts from overfeeding but it went away after a week. Could the bump be an infection from the mother?

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on December 26th, 2017

It's possible if there was a wound on Hamilton's lip and the mother has some sort of mammary infection going on as well. However, it's also possible that it just a coincidence, and something else caused an injury to make a blister or small abscess form. If the bump is not going away, it is hot to the touch or bothersome, or both mom and kitten appear to have infections, it would be best to seek veterinary care ASAP to have it looked at, drained, and treated with antibiotics.

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