TretinoinKeratolytic AgentsLentigoAcne VulgarisOintmentsPropionibacterium acnesAdministration, TopicalSkin AgingCosmeticsDermatologic AgentsChemexfoliationHyperpigmentationAcitretinMelanosisNicotinic AcidsEmollientsTrichloroacetic AcidKeratosis, ActinicSkin CareFacial InjuriesCarcinoma, Basal CellRetinoidsSkinAdministration, CutaneousSkin PigmentationDrug CombinationsDouble-Blind MethodAcne KeloidSebumAntineoplastic AgentsBenzoyl PeroxideTreatment OutcomeIsotretinoinPropionibacteriumSebaceous GlandsGram-Positive Bacterial InfectionsAcquired Hyperostosis Syndrome