Chapter 48 Immune-Mediated Dermatoses
Immune-mediated dermatoses are relatively uncommon diseases in domestic animals. This group may be divided into autoimmune and immune-mediated categories according to immunopathogenesis.
PEMPHIGUS COMPLEX
The pemphigus complex of diseases includes pemphigus foliaceus, pemphigus erythematosus, pemphigus vulgaris, pemphigus vegetans, panepidermal pustular pemphigus, paraneoplastic pemphigus, and drug-related pemphigus.
Etiology
The exact cause or stimulant for the production of the pemphigus antibody is unknown. Theories involve either abnormal immune regulation or abnormal antigen stimulation.
Clinical Signs
Pemphigus Foliaceus
Pemphigus Erythematosus
Pemphigus Vulgaris
Paraneoplastic Pemphigus
Diagnosis
Histopathologic examination of skin biopsies gives the most valuable diagnostic information. Obtain at least three biopsies of the freshest pustules, vesicles, or bullae or from the edge of an ulcerated lesion.
False-positive ANA titers may be seen in animals with pemphigus, rheumatoid arthritis, idiopathic thrombocytopenia, autoimmune hemolytic anemia, thyroiditis, endocarditis, cancer, hepatotoxicity, feline leukemia, feline infectious peritonitis, dirofilariasis, demodicosis, and flea allergy dermatitis; they even may be seen in clinically normal animals.
Pemphigus Foliaceus
Pemphigus Erythematosus
Pemphigus Vegetans
Paraneoplastic Pemphigus
Differential Diagnoses
The major differential diagnoses for pemphigus foliaceus include the following.
Generalized Pustular Crusting

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