<prompt> A girl about to marry has comedonal acne. Drug to treat such a case is:Topical antibioticBenzoyl peroxideRetinoidsEstrogen  <response>: Retinoids are mainly comedolytic Acne Comedones are characteristic of: Acne vulgaris Comedones are: Small cysts, formed in hair follicles, due to blockage of the follicular orifice by the retention of sebum and keratinous material. Ref : Ref : Thomas b Habif 6th Ed. 