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the excessive growth of hair on a person’s body where only downy hairs usually grow.

There are several kinds of hypertrichosis. Heterogeneous hypertrichosis occurs in girls and women; it is the appearance of a beard, moustache, or male-type hair growth. (In men, pubic hair grows in a diamond shape; in women, in the form of a triangle with the upper boundary the horizontal side.) Hair growth increases during the period of sexual development and before or during the climacteric. Heterochronous hypertrichosis is the premature appearance of hair as a secondary sex characteristic (the appearance of a beard, moustache, or pubic hair in children). It is caused by a developmental anomaly or a disease of the endocrine glands. Heterotypic hypertrichosis is an increased amount of hair in unusual places, such as the small of the back. Hypertrichosis can be partial, local, or distributed over the whole body. Limited hypertrichosis can be either hereditary or elicited by prolonged mechanical, chemical, thermal, or physical trauma.

In women with excessive growth of downy hairs on the face or extremities, pulling out the hairs, shaving, or applying greasy creams or depilatories can cause significant thickening of the hairs, which become coarse and stiff and begin to grow faster than usual. An application of a 10-15 percent solution of hydrogen peroxide makes the hairs colorless and less noticeable but does not curtail their growth. Depilatories (preparations which dissolve the core of the hair and do not affect the papillae from which they grow) can be applied in extreme cases and only on covered parts of the body. The best treatment consists of electroepilation with the aid of electrolysis, ultrahigh frequency, and diathermy.


References in classic literature ?
With a roar that mingled with the booming thunder from above he leaped toward the panther, who could only claw futilely with one huge paw while he clung to the branch with the other; but the ape-man did not come within that parabola of destruction.
Sheeta, catlike, alighted upon four out-sprawled feet, the weight of the ape-man crushing him to earth, the long knife again imbedded in his side.
The ape-man traveled swiftly through the forest, and about noon came to the site of the village, but to his disappointment found that the jungle had overgrown the plantain fields and that the thatched huts had fallen in decay.
The ape-man had acted so quickly that he had been unable to prepare himself to withstand the strain and shock of Numa's great weight upon the rope, and so it was that though the rope stopped the beast before his mighty talons could fasten themselves in the flesh of the black, the strain overbalanced Tarzan, who came tumbling to the ground not six paces from the infuriated animal.
A dozen paces he had gone when Tarzan's rope brought him to a stand once more--then he wheeled again upon the ape-man, only to feel the painful prick of a barbed arrow as it sank half its length in his quivering flesh.
But at length the agile ape-man saw his chance, and rushed in upon the beast's left side behind the mighty shoulder.
Buto, angered and mystified by the strange disappearance of his prey, wheeled and charged frantically in another direction, which chanced to be not the direction of Tarzan's flight, and so the ape-man came in safety to the trees and continued on his swift way through the forest.
At the pit's verge the ape-man dropped to the ground in the center of the trail.
A woman, screaming, ran forward and struck the ape-man across the face.
Could he recall and measure the service the ape-man had performed for him?
From the surrounding village the ape-man heard the bustle of preparation for the feast.
Striking, clawing, and snapping, the ape-man fought--fought as his foster people had taught him to fight--fought like a wild beast cornered.