Eosinophilic inflammatory skin diseases affect cats Eosinophilic Skin Diseases in Cats In cats, there are three eosinophilic skin diseases. Classic presentation of an eosinophilic ulcer on the lip of a cat. An eosinophilic ulcer is a well-circumscribed erosive to ulcerative lesion... read more 
, dogs Eosinophilic Lesions in Dogs In dogs, lesions histologically characterized as eosinophilic granulomas have been reported. These lesions are rare but have been noted in the oral cavity as ulcerated or vegetative masses or... read more , and horses Eosinophilic Lesions in Horses This horse developed widespread nodular lesions confirmed to be eosinophilic granulomas after biopsy. Horses may develop nodular lesions that may or may not be exudative. Lesions may occur anywhere... read more 
. The most common underlying cause is a hypersensitivity reaction to an allergen (insect, environmental, adverse food reaction). In some cases, the underlying trigger is unknown.
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Also see pet health content regarding eosinophilic diseases in cats Eosinophilic Granuloma Complex in Cats This group of skin conditions affects cats, dogs, and horses. Eosinophilic granuloma complexes have varying signs but seem to be caused most commonly by an allergic hypersensitivity. In cats... read more , dogs Eosinophilic Granuloma Complex in Dogs Eosinophilic granuloma complex is rare in dogs. It is recognized more commonly in cats and horses. When seen in the dog, this disorder is associated with unusual reactions to insect bites or... read more , and horses Eosinophilic Granuloma Complex in Horses Equine eosinophilic granuloma (also called eosinophilic granuloma with collagen degeneration, nodular necrobiosis of collagen, or collagenolytic granuloma) is the most common nodular skin disease... read more .
