Rapid hair regrowth in a patient with alopecia universalis treated with a JAK3/TEC family kinase inhibitor
A 12-year-old boy presented with longstanding alopecia universalis (AU) in March 2024, with complete loss of scalp hair corresponding to a Severity of Alopecia Tool (SALT) score of 100, as well as loss of all eyebrows, eyelashes, and body hair. Responses to previous treatments were suboptimal. In September 2024, the patient (SALT 50) was switched to ritlecitinib 50 mg QD as it had become available in Hong Kong through a medication access programme. By February 2025, the patient’s SALT score had improved to 0–10 (complete scalp hair regrowth), with complete regrowth of eyebrows and eyelashes. 

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