Cat allergic dermatitis refers to a skin condition caused by an allergen.Flea allergic dermatitis, or FAD, is very common in cats. Cats become allergic to the fleas saliva, which is injected into the skin when the fleas feed. In sensitive cats, just one or two bites can cause severe irritation.
Cats with flea allergic dermatitis need very strict flea control. However, many flea treatments only kill fleas after they have bitten, which means that your cat may still get bitten and have reactions from time to time.

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Fleas and flea control in cats. Reading time Minutes. Updated 26th Sep 2025. First published 23rd May 2024. The most common flea found on cats and dogs is the cat flea (Ctenocephalides felis).

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Cats with flea allergy dermatitis will have itching that can range from minimal to severe, depending on how sensitive the cat is to the flea saliva. When fur is parted to inspect for skin irritation, small, solid bumps will be visible.
Flea Allergy Dermatitis (FAD): Much like our cats, some of us humans can also develop an allergy to flea saliva, leading to intense itching and inflammation at the site of the flea bite. This allergic reaction can result in hives or a rash that can be quite uncomfortable.