Eosinophilic granulomas, formerly called lick granulomas, are a group of
skin diseases producing ulceration and granulation of the skin. Some sores may
be associated with an allergic skin disorder, such as feline miliary dermatitis, food hypersensitivity, or inhalant
allergy. In others,
the cat’s immune system may be
suppressed by a condition such as feline leukemia.
Indolent (rodent) ulcers are most often found on the middle of the upper
lip, occasionally on the lower lip, or in the mouth behind the last upper
molar. The ulcer is not itchy or
painful. It has the potential to develop into
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Eosinophilic plaque is an itchy skin
condition that occurs in young to middle-age cats (the average age is 3 years).
It is characterized by well-circumscribed, raised, red plaques with hair loss. These
plaques are found on the abdomen and inner thighs. They are believed to be
caused by an allergy, including flea allergies. The diagnosis is made by a
biopsy of the plaque.
Linear granulomas, also called feline eosinophilic granulomas, occur in
kittens and young cats (the average age is 1 year), more often in females than
in males. They are circumscribed, raised, and red but present a linear rather
than a circular appearance. They occur on the backs of the hind legs, in most
cases on both sides, one side being the mirror image of the other. Linear
granulomas also involve the foot pads and may occur in the mouth or on the
chin. This condition is believed to be the result of an allergy. Cases just
involving the foot pads may be a reaction to something in the litter. Diagnosis
is like that for eosinophilic plaque.
Mosquito bite hypersensitivity affects the bridge of the nose and tips of
the ears and produces itching of the pads of the feet. Characteristically, you
will see crusty sores with erosions and scabs. When the condition is severe and
generalized, it is accompanied by fever and swollen lymph nodes. It disappears
in winter (when there are no mosquitoes). Cats with hypersensitivity to
mosquito bites should be kept indoors.
Treatment: Identify the underlying cause of the problem, if possible, and
treat it accordingly. Chlorpheniramine (Chlor-Trimeton) can help relieve the
itching. Cortisone can be administered directly into the sore by injection.
Oral cortisone preparations are required in most cases. Intramuscular
injections of methylprednisolone acetate have also been used. Treatment should
be vigorous, because eosinophilic granulomas are difficult to treat and tend to
recur. Veterinary supervision is essential.
WebMD Veterinary Reference from "Cat Owner's Home Veterinary Handbook"