My cat has a strange round spot on her back. Why did it swell after gel?

Question

Possible diagnosis of strange round lesion on shoulder/back. No pain or itching. Normal behavior. Extremely rainy/wet for several days. Application of antibiotic gel followed by rapid swelling, no other change. Pet's info: Cat | Mixed Breed | Female | 1 year and 10 months old

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

This presentation could be due to a trauma or localised spot of skin infection (likely to be caused by bacteria but fungal infection is possible). A check up, appropriate disinfection and eventually antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem. Disinfection can eventually be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid licking (if any). Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

My cat has a strange round spot on her back. Why did it swell after gel?

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