Skip to main content Skip to Search Box

Definition: alopecia from The Chambers Dictionary

baldness, hair loss. [Gr alōpekiā fox-mange or a bald spot, from alōpēx fox]

■ alopecoid
/al-ō-pē'koid or al-op'i-koid/ adj

fox-like.

❑ alopecia areata
/ar-ē-ä'tƏ or ar-ē-ā'tƏ/ n

baldness occurring in patches on the scalp.


Summary Article: Alopecia
from Black's Medical Dictionary, 43rd Edition

Hair loss. It may be localised or total. The commonest type, which is hereditary, is male baldness (androgenic alopecia). Female balding spares the anterior hair line, develops later, and is less severe than the male variety. Diffuse, sudden and rapid hair loss sometimes occurs after childbirth, severe illness or infection (telogen alopecia); it begins 8–12 weeks after the causative event and recovery is complete in most cases, but the condition is permanent in a few. Persistent diffuse hair loss may be caused by severe iron deficiency or HYPOTHYROIDISM, or may be drug-induced.

Patchy localised hair loss is commonly caused by fungal infections (tinea capitis – see RINGWORM), especially in the tropics. It may also be due to trauma, such as hair-pulling by children (trichotillomania) or disturbed adults, or hair-straightening by African or Afro-Caribbean women (traction alopecia). Rarely, diseases of the scalp such as discoid lupus erythematosus (see under LUPUS) or lichen planus (see under LICHEN) may cause patchy alopecia with scarring which is irreversible. The long-term effects of radiotherapy may be similar.

Treatment

depends on the cause. Certain antifungal drugs cure tinea capitis. Correction of thyroid or iron deficiency is effective but only when those deficiencies are the underlying cause. Male baldness may be modified somewhat by long-term use of minoxidil lotion, or improved permanently by various types of hair-follicle grafting of transplants from the occipital scalp. Female balding is sometimes helped by treatment with anti-androgen/oestrogen medication.

Copyright © A & C Black Publishers Ltd

Related Articles


Full text Article ALOPECIA
Epilepsy A to Z: A Concise Encyclopedia

Alopecia is the loss or thinning of hair. Infrequently, patients on valproic acid, topamax, lamotrigine, and zonisamide may develop alopecia NatschS

Full text Article alopecia (or baldness)
The Macmillan Encyclopedia

An absence of hair from areas of the skin on which it normally grows. The loss of hair with ageing in men is largely hereditary. In women,...

See more from Credo