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Classification of alopecia according to etiology

Non Scarring

The follicle is not destroyed, it undergoes functional changes.

  • Androgenic Alopecia, Common Alopecia or Common Baldness (the most frequent, representing 90%).
  • Traumatic Alopecia (trichotillomania, pressure or traction).
  • Alopecia Areata (Alopecia Areata Totalis or Alopecia Areata Universalis)
  • Hereditary syndromes
  • Systemic diseases
  • Drugs or Medications

Diffuse Alopecia:

  • DPA (Diffuse Patterned Alopecia)
  • DUPA (Diffuse UnPatterned Alopecia)



  • Frontofibrosing alopecia
  • Caused by disease of the hair follicle itself or independent.
  • Aplasia Cutis Congenita
  • Epidermolysis Bullosa
  • Folliculitis Decalvans
  • Ichthyosis
  • Epidermal Nevus
  • Lymphoma
  • Metastasis
  • Lichen Planus, Sarcoidosis, LES
  • Mycotic, bacterial, viral and protozoal diseases
  • Tumours (Basal Cell Epithelioma, Spinocellular Epithelioma)
  • Darier’s disease