<prompt> A girl about to marry has comedonal acne. Drug to treat such a case is: March 2013Topical antibioticBenzoyl peroxideRetinoidsEstrogen  <response>: Ans. C i.e. RetinoidsRetinoids are mainly comedolyticAcneComedones are characteristic of: Acne vulgarisComedones are:- Small cysts,- formed in hair follicles,- due to blockage of the follicular orifice- by the retention of sebum and keratinous materialAcen vulgaris is caused by: Obstruction of pilosebaceous duct Nodulocystic acne NATreatment of NA: Isotretinonin synthetic retinoic acid 