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My cat has a lump after vaccine. Is it necrosis or just healing?

Updated On September 23rd, 2025

Pet's info: Cat | Siamese | Female | spayed | 9 years and 3 months old | 6 lbs

Hello my cat got her annual vaccine, and after a few days she developped a lump. after a few days a crust appeared on the skin. it became inflammed. I took her to the emergency and they gave her antibiotics and betadine. It's been now 3 days that she took the medicine. I went back to check today and the veterinary told me it might be a necrosise. she has to go back next tuesday and if it's not better, she will do a surgery . I would a confirmation it could be a necrosise? thanks so much

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1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on May 23rd, 2019

Oh my goodness. So sorry this happened! When the skin dies that is called necrosis and this does not look that way to me. With necrosis the skin turns black and usually has an infected odor. I think this is healing OK being that it has only been 3 day. I would personally give it more time. She should be on antibiotics for quite a while (about 2 weeks total) and I would use a strong topical antibiotic as well.

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