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| − | *Usually involves [[Skin Immunologic - Pathology#Type I reactions|Type I reaction]] and [[Skin Immunologic - Pathology#Type IV reactions|Type IV reaction]] and cutaneous basophil hypersensitivity
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| − | *Mainly dorsolumbosacral area involved, abdomen, caudomedial thighs, flanks, neck of cats
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| − | *Secondary trauma is self-inflicted
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| − | *Grossly:
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| − | **Papular dermatitis
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| − | **Secondary excoriations
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| − | **Alopecic nodule if chronic
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| − | *Microscopically:
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| − | **Hyperplastic superficial perivascular dermatitis
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| − | **Oedema, [[Mast Cells|mast cells]], [[Basophils|basophils]], [[Eosinophils|eosinophils]], [[Lymphocytes|lymphocytes]], histiocytes
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| − | **Fibropruritic nodules covered by hyperplastic epidermis
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