Laboratory Studies
No laboratory test, except histopathologic examination, is diagnostic.
Histologic Findings
In the early phase, pilosebaceous follicles filled with keratotic plugs and a mild perifollicular inflammatory infiltrate are observed. Cystic dilatation of the hair follicles may be evident on the cheeks. Later, atrophy of both hair follicles and sebaceous glands, as well as a dermal fibrosis, may appear.
Staging
Two stages may eventually be observed: an early stage characterized by follicular hyperkeratosis and a late stage with some evidence of fibrosis and atrophy.
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