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What treats cat flea allergy dermatitis itching and skin sores?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed | 7 years and 8 months old | 13 lbs

Two of my cats have flea allergy dermatitis. I used PetArmour Plus, it had the same ingredients as Frontline. What can I use to help with the itching and get rid of the crusty papules. Please help me figure out what is best for them. Am I using the correct flea treatment? It looks very red, crusty and sore. I tried to get the best pictures I could. They didn't want to cooperate very well.

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2 Answers

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on January 7th, 2018

I'm sorry your cats (and you!) are dealing with you. Unfortunately, once a cat has a flea dermatitis, the itching and skin problems can continue even once you get rid of the fleas. The degree of which really depends on the severity of their sensitivity to flea bites. Often, we have to use antihistamines or steroids to resolve the inflammation. Sometimes we also have to incorporate antibiotics if there is an infection. For dogs, there are topical shampoos we can use, but those are often not a good option for cats. So, I would recommend having your veterinarian examine your cats' skin to determine if there is a secondary skin infection or just inflammation in order to help you determine the best treatment. Good luck! I hope that was helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.

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    Answered By Justin Plunk, DVM

    Veterinarian

    Published on September 13th, 2017

    Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Without seeing your cat, it is difficult to say if additional treatment is needed in order to clear up an infection that may be present. A skin infection can occur secondary to flea bites because dogs and cats will lick, scratch, and bite at their skin enough to cause sores known as excoriations. Additionally, the fleas, even when under control, can leave an itching sensation for a few days. Unfortunately, there isn't an over-the-counter recommendation to be made here, so if you notice any sores or continued itching, I would recommend having him seen by a veterinarian for assessment and treatment(s) that may be indicated. Also, there may be another issue going on if the fleas have been eradicated from his environment for a while. If you haven't done so, vacuuming carpets, couches, and bedding where he spends his time is important as the fleas we are able to see are but 5% of what is in the environment, and you could have a bunch of flea eggs, pupae, and larvae waiting to hatch, become adults, and continue their reproductive cycle. Hope this helps!

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