Alopecia universalis

Alopecia universalis (AU) is the most extensive form of alopecia areata, an autoimmune condition characterized by the complete loss of hair on the entire body. This includes the scalp, eyebrows, eyelashes, beard, axillary hair, pubic hair, and all other body hair. AU is considered the most severe end of the alopecia areata spectrum, which ranges from patchy hair loss (alopecia areata) to total scalp hair loss (alopecia totalis) to complete body hair loss (alopecia universalis). The condition results from an immune-mediated attack on hair follicles, in which T-lymphocytes target the hair bulb, disrupting the normal hair growth cycle. Importantly, the hair follicles are not permanently destroyed, meaning regrowth remains theoretically possible. Alopecia universalis primarily affects the integumentary system (skin and hair). Beyond the cosmetic impact, loss of nasal hair, eyelashes, and eyebrows can increase vulnerability to dust, allergens, and sun exposure around the eyes. Nail changes, including pitting, ridging, and brittleness, may also occur in some patients. The condition can have a profound psychological and emotional impact, affecting quality of life, self-esteem, and social functioning, particularly in children and adolescents. There is a genetic predisposition to alopecia universalis, with associations identified with several HLA genes and other immune-related loci. Treatment options have historically been limited and often unsatisfactory for this severe form. Conventional therapies include topical and systemic corticosteroids, topical immunotherapy (such as diphenylcyclopropenone), and immunosuppressive agents, though response rates in AU are generally lower than in milder forms of alopecia areata. More recently, JAK inhibitors (such as baricitinib, which received FDA approval for severe alopecia areata in 2022) have shown significant promise in promoting hair regrowth in patients with alopecia universalis, representing a major advance in the treatment landscape.

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