Overview Topical Treatment and Prevalence of P. Acnes Status: Completed Trial end date: 2018-01-01 Target enrollment: Participant gender: Summary This study is about preventing surgical site infections of the shoulder. We hope to learn if clindamycin alone, benzoyl peroxide alone, or clindamycin and benzoyl peroxide together can affect growth of Propionibacterium acnes in the dermal layer. Phase: Phase 2 Details Lead Sponsor: University of Southern CaliforniaTreatments: Benzoyl PeroxideClindamycinClindamycin palmitateClindamycin phosphate