Hypertrichosis lanuginosa congenita

Hypertrichosis lanuginosa congenita (HLC), sometimes referred to as 'congenital generalized hypertrichosis' or historically and colloquially as 'werewolf syndrome,' is an extremely rare genetic condition characterized by excessive growth of fine, soft lanugo hair (the type of hair normally seen on fetuses) covering most of the body. Lanugo hair, which is typically shed before or shortly after birth in unaffected individuals, persists and continues to grow throughout life in people with HLC. The excessive hair growth can cover nearly the entire body surface, including the face, ears, and trunk, though the palms of the hands and soles of the feet are usually spared. Hair length can reach several centimeters and may be lighter or darker depending on the individual's background. The condition primarily affects the integumentary system (skin and hair). Aside from the generalized hypertrichosis, individuals with HLC typically do not have other significant physical abnormalities or intellectual impairment, distinguishing it from other hypertrichosis syndromes that may be associated with gingival hyperplasia or other systemic features. However, some cases have been reported with associated dental anomalies. The excessive hair growth can cause significant psychosocial distress and impact quality of life. There is currently no cure for hypertrichosis lanuginosa congenita. Management is primarily symptomatic and focuses on hair removal techniques, including shaving, waxing, depilatory creams, electrolysis, and laser hair removal, though results vary and regrowth is common. Psychological support and counseling are important components of care, particularly for children and adolescents. Genetic counseling is recommended for affected families. Research into the genetic basis of HLC is ongoing, with some families showing linkage to specific chromosomal regions, but the precise causative gene has not been definitively established in all cases.

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