Dermatology: Practical and Conceptual


Image Letter  |  Dermatol Pract Concept 2021;11(1):e2021148 1

Dermatology Practical & Conceptual

Sebaceous Filaments
Yuvrah Singh1, Shekhar Neema1, Amit Bahuguna1, Disha Dabbas1

1 Department of Dermatology, Armed Forces Medical College, Pune, India

Key words: sebaceous filaments, Demodex, mites, dermoscopy

Citation: Singh Y, Neema S, Bahuguna A, Dabbas D. Sebaceous filaments. Dermatol Pract Concept. 2021;11(1):e2021148.  
DOI: https://doi.org/10.5826/dpc.1101a148

Accepted: August 17, 2021; Published: January 29, 2021

Copyright: ©2021 Singh et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License BY-
NC-4.0, which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original author and 
source are credited.

Funding: None.

Competing interests: The authors have no conflicts of interest to disclose.

Authorship: All authors have contributed significantly to this publication.

Corresponding author:  Shekhar Neema, MD, Department of Dermatology, Armed Forces Medical College, Pune, Maharashtra, India. 
Email: shekharadvait@gmail.com

Case Presentation

A 16-year-old boy with a known case of autism spectrum dis-

order presented with complaints of multiple yellowish white 

deposits over hair-bearing areas of his face for the previous 

3 years. On examination, there were multiple filamentous, 

off-white to yellowish, follicular growths in his perioral 

region, eyelashes, eyebrows, nose, and cheeks (Figure 1A). 

Dermoscopy revealed uniform cylindrical, solid, off-white 

colored deposits encircling normal hair follicles (Figure 1B). 

The gram stain and potassium hydroxide preparations were 

negative. The growths were clinically diagnosed to be seba-

ceous filaments.

Figure 1. (A) Filamentous, off-white to yellowish follicular growths in the perioral region, eyelashes, eye-

brows, nose, and cheeks. (B) Uniform, cylindrical, solid, off-white colored deposits encircling normal hair 

follicles seen on non-polarized dermoscopy.