Sebaceous adenitis (SA) is an inflammatory disorder that causes immune-mediated destruction of the sebaceous glands. The pathogenesis is likely multifactorial; however, an autosomal recessive mode of inheritance has been proposed for the standard poodle and Akita.
Related Article: Canine Scaling Disorders
Several distinct presentations are recognized, although the hallmark clinical sign is adherent crusting of hair shafts with follicular casts (ie, keratin collaring) (See Figure 1 above, Labradoodle with adherent crusts (ie, keratin collaring) on hair shafts. The long, curly hair coat has become straight and brittle). Because several diseases can appear clinically similar to SA, it can only be definitively diagnosed by biopsy.
Multiple circular lesions with fine silvery scales on the pinna of a vizsla.