Acne VulgarisPropionibacterium acnesTretinoinDermatologic AgentsBenzoyl PeroxideKeratolytic AgentsLentigoOintmentsAdministration, TopicalSkin AgingCosmeticsChemexfoliationHyperpigmentationAcitretinMelanosisNicotinic AcidsEmollientsTrichloroacetic AcidKeratosis, ActinicSkin CareFacial InjuriesCarcinoma, Basal CellRetinoidsSkinAdministration, CutaneousSkin PigmentationDrug CombinationsDouble-Blind MethodAcne KeloidSebumAntineoplastic AgentsTreatment OutcomeIsotretinoinPropionibacterium