Blue Light Therapy of C. Acnes

Inclusion Criteria: * Healthy male * 18 years or older Exclusion Criteria: * Allergy to benzoyl peroxide or chlorhexidine * \<18 years of age * Previous history of shoulder infections * Antibiotics taken within one month of research visit * Immunocompromised state * Active cancer * Diabetic * Skin lesions or abrasions over the deltopectoral interval * Topical corticosteroid treatment to either shoulder or or systemic corticosteroid treatment within 2 weeks of research visit * Topical benzoyl peroxide treatment to either shoulder within 2 weeks of research visit * Blue light therapy treatment to either shoulder within 2 weeks of research visit * Prior incision over the deltopectoral interval of either shoulder * Contraindication to blue light treatment