My cat's jaw is swollen. Could it be an allergic reaction to dewormer?

Question

My male cat Lucky came in late. His lower jaw is swollen. He’s actually sleeping now, I’m a wreck. I administered Pet Armor deworming pills to all my cats; could he be allergic or too much piperazine? Didn’t see bite marks; I do live in forest. If not better by morning, I’ll take him to vet. Really swollen! Pet's info: Cat | Mixed Breed | Male | neutered | 3 years and 9 months old

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

This does not look like an allergic reaction which could come from a systemic medication. This lump/growth should be ideally examined by your veterinarian to have a definitive diagnosis. Your vet will examine it and possibly perform with an FNA (fine needle aspiration) or a biopsy. Differentials would include skin cyst, an insect bite, the result of a trauma, infections or benign or malignant type of tumors (very unlikely given the age). Hope this answer was helpful, but 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. If this answer was helpful please let us know, this will be used to improve our service!

My cat's jaw is swollen. Could it be an allergic reaction to dewormer?

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