Abstract
Proliferating trichilemmal tumor (PTT) is an uncommon lesion that is characterized by an exuberant growth of cells derived from the external root sheath of the hair follicle. Histologically, it presents as trichilemmal keratinization. It is known to be derived from trichilemmal cysts and to have a potential for malignant conversion. In the latter case, it is called malignant proliferating trichilemmal tumor [[1]]. As it has some low-grade malignant potential as well as unpredictable biological behavior, wide excision with a 1 cm margin of normal tissue is required in order to prevent recurrence.
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