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| First hair growth stage where new hair is produced |
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| Located in the base of the hair follicle; when it contracts, the hair stands straight up, causing goosebumps |
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| Ingrown hairs from shaving |
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| Second regression (falling out) stage; in the catagen stage, the hair shaft grows upward and detaches itself from the bulb |
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| Substance, usually a caustic alkali preparation, used for the temporary removal of superfluous hair by dissolving at the skin level |
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| Cone-shaped elevation at the base of the follicle that fits into the bulb. The papilla is filled with tissue that contains the blood vessels and cells necessary for hair growth and nourishment of the follicle |
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| Removal of hair by means of an electric current that destroys the root of the hair |
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| Hair-removal treatments such as waxing, electrolysis, or laser hair removal |
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| The swelling at the base of the follicle that provides the hair with nourishment; it is a thick, club-shaped structure that forms the lower part of the hair root |
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| The tubular shield that surrounds the lower part of the hair shaft; the "pore" where hairs grow |
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| Part of the hair that lies within the follicle |
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| Portion of the hair that extends or projects beyond the skin, consisting of the outer layer (cuticle), inner layer (medulla), and the middle layer (cortex). Color changes happen in the cortex |
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| Growth of an unusual amount of hair on parts of the body normally bearing only downy hair, such as the face, arms, and legs of women or the backs of men |
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| Excessive hair growth where hair does not normally grow |
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| The hair on a fetus; is extremely soft |
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| Final hair-growth stage, the resting stage. During the telogen stage, the hair is at its full size and is erect in the follicle |
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| The scientific study of hair and its diseases |
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