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Young male cat, 1 inch in diameter mass with red splotchy pigment at site of chip implant. Has "popped" before when grabbed by the nape. This is the second time in which it has grown and continues to grow in size. Not completely solid, Has slight give when pressed. No appetite loss nor depression. Does not seem to itch nor hurt.

Young male cat, 1 inch in diameter mass with red splotchy pigment at site of chip implant. Has "popped" before when grabbed by the nape. This is the second time in which it has grown and continues to grow in size. Not completely solid, Has slight give when pressed. No appetite loss nor depression. Does not seem to itch nor hurt.

Updated On May 29th, 2017

Pet's info: Cat | Mixed Breed | Male | neutered | 3 years and 4 months old | 18 lbs

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Answered By Christina Kellogg, DVM

Veterinarian

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What you are describing almost sounds like an abscess. An abscess is a localized pus-filled pocket of infection and inflammation. I have never seen a reaction or infection caused by a microchip but that does not mean it can't happen. I would recommend having Jasper examined by his veterinarian to determine what is causing the swelling. His vet might have to remove the swelling/mass and have it tested/analyzed to see what exactly it is. This testing would help make sure that it is not cancerous lump. If it is determined to be from the microchip, I would have your vet contact the microchip manufacturer and let them know as that shouldn't happen with microchips. Best of luck to you and Jasper.

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    Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

    Veterinarian

    This kind of lump/growth needs to be ideally assessed by your veterinarian to have a definitive and specific answer. Usually there are two ways your vet can do that a part from examining it directly during physical examination. A biopsy can be taken under local or general anesthetic, otherwise a smaller sample through a fine needle can be aspirated (this technique is called FNA= fine needle aspiration). Differentials include skin cysts, infections, benign or more sinister type of tumors. 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.

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