Alopecia: Etiology
Alopecia may result from serious illness, drugs, endocrine disorders, certain forms of dermatitis, hereditary factors, radiation, or physiological changes as a part of the ageing process.
Alopecia: Types
1. Alopecia areata : Loss of hair in sharply defined patches usually involving the scalp or beard. 2. Alopecia capitis totalis / Alopecia totalis : Complete or near complete loss of hair on the scalp. 3. Cicatricial alopecia : Loss of hair due to formation of scar tissue. 4. Alopecia congenitalis : Baldness due to absence of hair bulbs at birth. 5. Alopecia follicularis : Baldness due to inflammation of the hair follicles of the scalp. 6. Alopecia liminaris : Loss of hair along the hairline, both front and back, of the scalp. 7. Male pattern alopecia : Typical hair loss pattern of males in which the alopecia begins in the frontal area and proceeds until only a horseshoe area of hair remains in the back and temples. This loss is dependent on the presence of the androgenic hormone testosterone. 8. Alopecia medicamentosa : Loss of hair due to administration of certain medicines, esp. those containing cytotoxic agents. 9. Alopecia pityroides : Loss of both scalp and body hair acc...
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