Follicular cast
An accumulation of keratinous debris around the hair
shaft seen protruding from the follicular ostium or
present when hairs are plucked and examined.
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Indicates a defect of follicular keratinisation. Commonly
seen in idiopathic seborrhoea and sebaceous adenitis in dogs,
and in some cases of demodicosis and dermatophytosis. Often
co-exists with comedones.
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