It is hard to say why cats develop abscesses more frequently than other domestic species but there are several plausible reasons. A bite from a cat wound is more likely to become infected than a bite from most other species due to the bacterial residents of cat mouths. Since cats bite each other fairly frequently this is certainly one reason for the high number of abscesses. This situation is exacerbated by the tendency for cat bite or scratch wounds to have small entry wounds but to cause damage subcutaneously which becomes infected after the small skin wound is already healed. Cats also are prone to immunosuppressive viral illnesses such as feline immunodeficiency virus and feline leukemia virus which makes infected cats more likely to suffer an abscess after a wound.
Most abscesses start out as cellulitis, which is infection of the tissues under the skin.
In some cases it is possible to prevent abscess formation by early detection of the presence of cellulitis. Signs of early infection may include lameness, localized pain, lethargy or reluctance to eat. If your cat exhibits any of these signs and your vet can determine that cellulitis is present early administration of an appropriate antibiotic may prevent abscess formation. After a brief period of cellulitis, an abscess forms. The cat's body attempts to fight the bacterial infection by forming a capsule around it and flooding the capsule with a large number of white blood cells.