Summary: The purpose of the study is to learn about the safety and effects of the study medicine (called ritlecitinib) for the treatment of chronic spontaneous urticaria (CSU) that is not effectively treated by antihistamines which are used to stop the body's allergy alarm system from overreacting. Chronic spontaneous urticaria is a disease that causes itchy hives and swellings in the deep layers of skin a...

Summary: Alopecia areata (AA) is a chronic relapsing autoimmune disease characterized by nonscarring hair loss affecting children, adolescents, and adults across all ages, races, and genders. AA primarily affects the scalp; however, it also can affect nails, eyelashes, eyebrows, and other hair follicles on the patient's body. The 3 main types of AA are: * Patchy alopecia (PA), as seen in 90% of clinical di...

Summary: Vitiligo affects approximately 1 to 2% of the global population and significantly impacts people's quality of life. areas of high stress. Ritlecitinib, an orally administered inhibitor of JAK3 (Janus kinase)/ TEC (tyrosine kinase expressed in hepatocellular carcinoma) has shown effectiveness and safety for the treatment of vitiligo. In a phase 2b trial, three doses of ritlecitinib, 200/50 mg, 100/...