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My cat has scabs on her back after spay. Is it allergies or fleas?

Updated on September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | spayed | 6 lbs

Hi! We have an approx 1 1/12 yr female shorthair cat whom we took the beg of Feb to get spayed & they also put the microchip in her. She's strictly an indoor cat; but we live in the country & there's always that chance she could get out. Since she got home she's had these scabs on her back...at first right over her shoulder blades, where the chip is. As time has gone on, they've gotten a lot worse. I've taken her to the vet once already. No fleas! They gave her an antibiotic shot w/o relief.

1 Answer

Most Helpful Answer

Lauren Jones VMD

Answered By Lauren Jones VMD

Veterinarian

Published on April 24th, 2017

I'm sorry to hear that Spaz has such uncomfortable skin lesions! Some common causes of scabs over the back include underlying allergies (to food, the environment, or fleas, ringworm, or other inflammatory issues. Make sure that Spaz is receiving a high quality flea preventative once a month (such as Advantage or Revolution), even though you are not seeing fleas. Some animals are highly allergic to flea bites, such that the fleas saliva injected after one bite can incite an allergic reaction, even if you are not finding fleas on her skin. Fleas can enter the house on our clothing and then hop over to our indoor pets.

Since her skin lesions have not responded to antibiotic injections (I assume Convenia?), she may need to try a different class of oral antibiotics, as well as corticosteroids or other allergy management medications. Spaz should go back to her vet for a recheck to discuss these other medication options. If she does have allergies, it can take a good bit of time and trial and error to help her achieve some relief. I hope that she's feeling better soon!
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