This study was conducted to determine the prevalence of infiltrative lymphocytic mural folliculitis (ILMF) in skin-biopsy specimens from 354 cats with various inflammatory dermatoses and from 33 cats with normal skin. Although ILMF was present in 33/47 dermatoses evaluated, the prevalence of ILMF in allergic dermatoses (116/172 cats; 67%) was significantly greater than that in non-allergic dermatoses (61/182 cats; 33%). Cats with allergic dermatoses had a 4.1 times greater odds of having ILMF than cats with non-allergic dermatoses. ILMF was not observed in any of the normal skin specimens.

Superficial suppurative necrolytic dermatitis (SSND) of miniature schnauzers is a rare cutaneous and visceral reaction pattern associated with shampoo. This report describes SSND in a miniature schnauzer associated with application of an imidacloprid and flumethrin collar. Histopathology was consistent with SSND. Lesions resolved after treatment with methylprednisolone and marbofloxacin.