<qa>  What is the name of the treatment that is allowed for acne of the back, shoulders and chest4. Willing to refrain from using any treatments, other than the investigational product, including antibiotics, for acne present on the face. Topical acne treatments that do not have significant or measurable systemic absorption e.g., benzoyl peroxide, salicylic acid are allowed for treatment of acne of the back, shoulders and chest only. 