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Hypertrichosis lanuginosa congenita: lanugo hair growth all over the body, excluding the palms, soles, and mucous membranes, growing up to 3–5 cm. [21] Hypertrichosis congenita terminalis: terminal hair growth all over the body, excluding the palms, soles, and mucous membranes. [22] It is often associated with gingival hyperplasia. [22]
Lanugo is very thin, soft, usually unpigmented hair that is sometimes found on the body of a fetus or newborn.It is the first hair to be produced by the fetal hair follicles, and it usually appears around sixteen weeks of gestation and is abundant by week twenty.
This change normally occurs during adolescence, when vellus hair follicles in the underarms and groin grow into terminal hair follicles. [1] Hypertrichosis involves this same type of switching, but in areas that do not normally produce terminal hair. [1] The mechanisms for this switch are poorly understood. [1]
Hair colors can change well into puberty, as some genes aren't "switched on" until the hormones flood the body in adolescence. Eventually, usually in the 30s, human hair stops producing melanin ...
Vellus hair is not lanugo hair. Lanugo hair is a much thicker type of hair that normally grows only on fetuses . Vellus hair is differentiated from the more visible terminal or androgenic hair , which develops only during and after puberty , usually to a greater extent on men than it does on women.
It works on all hair colors and types, making it effective for fine or light-colored hairs that lasers may not effectively treat, and it’s the only treatment for permanent hair removal approved ...
Uncombable hair syndrome (UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [4] It was first reported in the early 20th century. [5] It typically becomes apparent between the ages of 3 months and 12 years. [6]
Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
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