Pilar cyst

Synonym:

Sebaceous cyst
Trichilemmal cyst

Pilar cyst is a scalp cyst containing keratin, with a cell wall histologically similar to the external hair root sheath.
While often intracutaneous, lesions may become polypoidal.
Asymptomatic lesions can become tender from trauma or secondary infection.
The tendency to multiple lesions can be inherited as an autosomal dominant trait.

Treatment:

• Surgical excision.

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