Home   Chapter Home   Jobs   Conferences   Fellowships   Books



Advertisement

Skin - Nonmelanocytic tumors

Benign nonmelanotic epidermal tumors / tumor-like lesions

Hair follicle nevus


Reviewer: Christopher Hale, M.D. (see Reviewers page)
Revised: 20 June 2012, last major update June 2012
Copyright: (c) 2001-2012, PathologyOutlines.com, Inc.

General
=========================================================================

● Rare, congenital, hamartomatous
● Usually on face

Case reports
=========================================================================

● 2 year old boy with nose nodule (Pediatr Dermatol 2008;25:60)
● 26 year old man with small soft nodules on his nose since childhood (Eur J Dermatol 2008;18:185)
● In a distribution following Blaskho's lines (J Am Acad Dermatol 2002;46:S125)

Dermoscopy
=========================================================================

● Many uniform hair follicles and an interfollicular pseudo-pigment network in the nodules

Gross description
=========================================================================

● Papule or plaque with vellus hairs

Micro description
=========================================================================

● Well-differentiated hair follicles and sebaceous glands
● No cartilage (seen in accessory tragus), central cysts or a central canal (seen in trichofolliculoma)

Electron macroscopy description
=========================================================================

● Follicular germ cells present
● Active fibroblasts around the follicles merge with colloid substance (J Dermatol 2001;28:324)

Differential diagnosis
=========================================================================

● Accessory tragus, trichofolliculoma

End of Skin - Nonmelanocytic tumors > Benign nonmelanotic epidermal tumors / tumor-like lesions > Hair follicle nevus


This information is intended for physicians and related personnel, who understand that medical information is often imperfect, and must be interpreted in the context of a patient's clinical data using reasonable medical judgment. This website should not be used as a substitute for the advice of a licensed physician.

All information on this website is protected by copyright of PathologyOutlines.com, Inc. Information from third parties may also be protected by copyright. Please contact us at copyrightPathOut@gmail.com with any questions (click here for other contact information).