This is a multicentre, randomized, assessor-blind, comparator-controlled evaluation of the efficacy, safety, and tolerability of Duac™Once Daily Gel and clindamycin phosphate gel in the topical treatment of mild to moderate facial acne vulgaris. A total of 1020 subjects will be enrolled, 510 per study arm. The subjects will be males and females between 12 and 45 years of age, inclusive, at the time of consent, who have mild to moderate facial acne vulgaris.