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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.
In alopecia areata, a hair follicle is attacked by the immune system. T-cells swarm the roots, killing the follicle. This causes the hair to fall out and parts of the head to become bald. Alopecia areata is thought to be a systemic autoimmune disorder in which the body attacks its own anagen hair follicles and suppresses or stops hair growth. [22]
Perhaps the most well-known condition to cause hair loss is alopecia, which, Massick explains, “causes your own immune system to attack the hair follicles [so that] the hairs just fall out ...
But in some cases, external factors — like stress — can affect hair, causing everything from thinning hair and a wider part, to a receding hairline, hair falling out in clumps or even patches ...
At the end of the resting phase, the hair falls out (exogen) and a new hair starts growing in the follicle, beginning the cycle again. Normally, about 40 (0–78 in men) hairs reach the end of their resting phase each day and fall out. [28] When more than 100 hairs fall out per day, clinical hair loss (telogen effluvium) may occur.
Hair loss is a disorder where your hair falls out and doesn’t come back. Common causes of hair loss like male pattern baldness and alopecia areata tend to worsen over time.
The hair loss is non-progressive and does not expand beyond these areas. It is a non-inflammatory, non-scarring form of hair loss easily confused with alopecia areata . In one report, the condition was incorrectly believed by the parents to be induced by doctors inserting intravenous cannulas into scalp vessels during the neonatal period.
Radiation induces hair loss through damage to hair follicle stem cell progenitors and alteration of keratin expression. [72] [73] Radiation therapy has been associated with increased mucin production in hair follicles. [74] Studies have suggested electromagnetic radiation as a therapeutic growth stimulant in alopecia. [75]