A Phase 1b, Randomized, Vehicle-Controlled, Double-Blind, Pharmacokinetics, Pharmacodynamics, and Safety Study of ARQ-255 Topical Suspension in Healthy Volunteers and Subjects with Alopecia Areata

This study is being done to evaluate the safety and tolerability of twice daily application of the study drug, ARQ-255 topical suspension 3% people with alopecia areata. There are 2 study drugs in this study: ARQ-255 topical suspension 3% and vehicle (placebo). Participants will be randomized (like drawing straws) to either ARQ-255 topical suspension 3% or vehicle to be applied twice daily for 12 weeks. A vehicle is a study treatment that looks like the test drug and is made from the same base products used to make ARQ-255 topical suspension 3%, but it does not contain any active study ingredients.