Pathologists often feel discomfort when confronted with scalp biopsies, especially in the case of horizontal sectioning, which is particularly useful in the event of nonscarring alopecia. Apart from a profound knowledge of follicular anatomy, one should be capable of correlating the histologic information with the clinical features of various inflammatory scalp disorders. This review addresses the basic principles of the interpretation of scalp biopsies and discusses the most common forms of scarring and nonscarring alopecia.
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