Global incidence of alopecia areata increased betw 1990 - 2021; from 20.43 million (19.77-21.09 million) in 1990 to 30.89 million in 2021 ( range of 29.95-31.82 million) - highest in USA 550/100,000. High in N.America, S.America, Southeast Asia, Australia. Lowestin Africa, Middle https://t.co/d3WA3CRFRC