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Baldness, or alopecia, lack or loss of hair, usually from the scalp, due to disease of hair follicles. Pattern baldness is an inherited tendency, often starting when a man is in his 20s. It is found in about 40% of the male population. Alopecia areata is a disease of unknown cause producing usually temporary patchy baldness, though it may be total. Prolonged fever, lupus erythematosus, ringworm, certain drugs, and poisons may lead to temporary baldness.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Augusta to Barlach, Ernst