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*Grossly:
*Grossly:
**Red papules and secondary excoriations
**Red papules and secondary excoriations
*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
*Mainly dorsolumbosacral area involved, abdomen, caudomedial thighs, flanks, neck of cats
*Secondary trauma is self-inflicted
*Grossly:
**Papular dermatitis
**Secondary excoriations
**Alopecic nodule if chronic
*Microscopically:
**Hyperplastic superficial perivascular dermatitis
**Oedema, [[Mast Cells|mast cells]], [[Basophils|basophils]], [[Eosinophils|eosinophils]], [[Lymphocytes|lymphocytes]], histiocytes
**Fibropruritic nodules covered by hyperplastic epidermis
==Signalment==
==Signalment==