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My cat has sores and bald spots from flea treatment. What can I do?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 8 lbs

After administering activyl on the back neck of my neck, he has now developed bald spots around his neck and back. And now there are crusty bloody sores in some bald spots. My vet appointment is not until Friday, Dec. 8th, and I don't know if my cat can wait that long. He has a crusty bloody sore on his face and on his neck. What can I do in the meantime, so my cat doesn't die? Please help

1 Answer

Most Helpful Answer

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Answered By Destini R. Holloway, DVM

Veterinarian

Published on December 4th, 2017

Poor guy. It sounds like he had a bad reaction to the Activyl. In cases of allergic reacitons you have to get him treated with a steroid shot +/- antihistamine shot to stop the reaction from continuing. Also you should wash the product off immediately to remove the stimulus. I would recommend bathing with a gentle dawn soap and then follow up with a cat friendly oatmeal based shampoo and a hot spot spray from your local pet store. Don’t put this spray on the face area and avoid the eyes. I am sorry your cat is having such a bad reaction. Hopefully this can help alleviate some of the irritation until his vet visit on Friday. This doesn’t sound life threatening, especially if he is otherwise eating, drinking and energy level is good. I would also consider getting his appt moved to an earlier date to get him some relief sooner. Best of luck with Sam and his skin and it’s best to avoid using this product in the future. Topical revolution can be tried the next time or even an oral medication such as Comfortis. Best wishes and take care.

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