Skin-nontumor / Clinical dermatology
Other dermatoses

Author: Mowafak Hamodat, M.D., MB.CH.B, MSc., FRCPC (see Authors page)

Revised: 21 June 2016, last major update July 2011

Copyright: (c) 2002-2016,, Inc.

PubMed Search: Alopecia [title] skin

Cite this page: Alopecia. website. Accessed August 18th, 2018.
Definition / general
  • Hair loss from head or body
  • Causes include baldness (pattern alopecia or androgenic alopecia), chemotherapy, hairstyling or hair drying, trichotillomania (compulsive pulling of hair) or other medical disorders
  • Adequate tissue sampling and appropriate laboratory processing, in combination with clinical information, provide the key to diagnosis (Histopathology 2010;56:24)
  • Alopecia areata: sudden hair loss causing patches to appear on scalp or elsewhere
  • Folliculitis decalvans: alopecia that involves scarring; redness, swelling and pustules around hair follicle, with subsequent follicular destruction and permanent hair loss
Clinical images

Images hosted on other servers:

Alopecia areata

Folliculitis decalvans

Microscopic (histologic) images

Images hosted on PathOut servers:

Folliculitis decalvans, courtesy of Angel Fernandez-Flores, M.D., Ph.D.

Images hosted on other servers:

Alopecia areata