Inclusion Criteria:  Subjects voluntarily sign the informed consent form (ICF); Age ≥ 18 years and <65 years, either male or female; Clinical presentation compatible with alopecia areata with a current episode lasting not exceeding ≤8 years. At least 50% scalp hair loss. Willing to comply with the study visits and requirements of the study protocol.  Exclusion Criteria:  Subject has taken a JAK inhibitor prior to randomization; Subjects who are unsuitable to the trial, as identified by the investigator.