Lead Sponsor

Aclaris Therapeutics, Inc.

Age

12 - No limit years

Sex

ALL

Healthy Volunteers

No

•1. Have a clinical diagnosis of stable patchy alopecia areata (AA) defined as no current areas of spontaneous regrowth.
•2. Have a Severity of Alopecia Tool (SALT) score of at least 15% up to 95% total scalp hair loss determined by the study investigator at baseline.
•3. Have a duration of the current episode of scalp hair loss of a minimum of 6 months and a maximum of 12 years.
•4. If a woman of childbearing potential (WOCBP), must have a negative serum pregnancy test at Screening (Visit 1) and a negative urine pregnancy test at Baseline (Visit 2) and agree to: use a highly effective method of birth control for the duration of the study; not be planning a pregnancy during the study duration and use contraception for 30 days after last application of study medication.

•1. Females who are nursing, pregnant, or planning to become pregnant for the duration of the study and up to 30 days after the last application of study medication.
•2. Diffuse alopecia areata.
•3. Concomitant hair loss disorder (by history or physical exam) such as androgenetic alopecia or scarring alopecia (e.g., cicatricial alopecia, frontal fibrosing alopecia, etc.).
•4. Active skin disease on the scalp (such as psoriasis or seborrheic dermatitis) or a history of skin disease on the scalp that in the opinion of the investigator would interfere with the study assessments of efficacy or safety.
•5. Active scalp trauma or other condition affecting the scalp that, in the investigator's opinion, may affect the course of AA or interfere with the study conduct or evaluations.
•6. The presence of a permanent or difficult to remove hairpiece or wig that will, in the opinion of the investigator, interfere with study assessments if not removed at each visit.

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