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Skin - Nonmelanocytic tumors

Cysts

Pigmented follicular cyst


Reviewer: Christopher Hale, M.D. (see Reviewers page)
Revised: 29 June 2012, last major update June 2012
Copyright: (c) 2001-2012, PathologyOutlines.com, Inc.

General
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● Variant of follicular (infundibular-type) cyst
● Hyperpigmented lesion with epidermal-type keratinization
● Contains laminated keratin, pigmented hair shafts, some growing hair follicles, usually head/neck

Case reports
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● 23 year old male with blue-black 0.5 cm nodule on neck (J Am Acad Dermatol 1989;21:1073)

Gross description
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● Solitary hyperpigmented nodule or dome-shaped papule, 0.4 to 1.5 cm in diameter

Micro description
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● Lined by squamous epithelium, sebaceous tissue
● Contains pigmented, medullated hair shafts

Micro images
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Medullated hair shafts in cyst lumen

Differential diagnosis
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Dermoid cyst (cutaneous)
Steatocystoma
Vellus hair cyst (eruptive)

End of Skin - Nonmelanocytic tumors > Cysts > Pigmented follicular cyst


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