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Why does my cat still have bald spots and lose fur after fleas?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male

Cat has bald patches on head and neck use to itch a lot but after flea treatment recently stopped itching but still loosing fur, did cat shampoo which reduced the loosing of hair but still loosing. Any solution to cure the bald patches I am attaching all the pictures of patches below

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2 Answers

Most Helpful Answer

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Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on May 15th, 2018

This is probably caused by an allergic reaction. first of all make sure you de-flea Milo regularly every month with a high quality spot on (ex. Advantage) as fleas are by far the most common reason for these reactions. If the fleas are not the problem, it could be an allergic reaction to food or an environmental factor. this is more complicated to treat and will sometimes require medications such as Steroids, anti histamines or cyclosporin in order to stop the allergy.

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on November 25th, 2017

    Thanks for using Petco Pet Education Center, formerly Petcoach! This is still most likely due to allergies if she is itchy, most likely due to fleas given the location. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

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