Pilar Cyst (Trichilemmal Cyst) Pilar cysts are relatively common benign growths that occur most frequently on the scalp. They go by many names, including wen, trichilemmal cyst, and isthmuscatagen cyst. Most are solitary, but it is not uncommon to see multiple pilar cysts in a single individual. Their appearance is similar to that of epidermal inclusion cysts, but the pathogenesis is completely different. There is a malignant counterpart called a metastasizing proliferating trichilemmal…
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