Frictional alopecia

Frictional alopecia is the loss of hair that is caused by rubbing of the hair, follicles, or skin around the follicle.[1] The most typical example of this is the loss of ankle hair among people who wear socks constantly for years.[2] The hair may not grow back even years after the source of friction has ended.

Cause

Hair loss on legs went largely undiagnosed, but is now thought to be quite common.[3] While the overall causes are still being explored, the primary culprit is currently thought to be friction from socks and footwear.[4] There is some debate as to what proportion is caused by friction, and what by androgen deficiency, minor vascular disease, rash of various causes, or thyroid deficiency.[5]

References
  1. Olberding, Matt. "What Causes Hair to Fall Off Your Legs?". livestrong.com.
  2. Jakhar, Deepak; Kaur, Ishmeet (2 October 2018). "Frictional (Sock) Alopecia of the Legs: Trichoscopy as an Aid". International Journal of Trichology. 10 (3): 129–130. doi:10.4103/ijt.ijt_96_17. PMC 6029005. PMID 30034193.
  3. Wei Siah, Tee; J Harries, Matthew (1 April 2014). "Anterolateral Leg Alopecia: Common but Commonly Ignored". International Journal of Trichology. 6 (2): 75–6. doi:10.4103/0974-7753.138595. PMC 4154156. PMID 25191043 – via ResearchGate.
  4. Zhao, Johnny; Cohen, Philip R. (15 August 2016). "Frictional alopecia of the distal legs: case series and review". Dermatology Online Journal. 22 (8). doi:10.5070/D3228032179. PMID 27617943.
  5. "Hair loss on Legs: Causes and Studies". www.hairlossgone.com.
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