<prompt> Comedones are seen in :PityriasisLichen planusAdenoma sebaceumAcne vulgaris  <response>: Ans is d Acne vulgaris Primary lesion of Acne Vulgaris is comedonesOpen comedones are Black HeadsClosed comedones are White HeadsComedones can evolve intoPapulesPustules CystsSite of Appearance requires presence of Sebaceous glandFace MCShoulderBack Upper chest 