TretinoinKeratolytic AgentsLentigoAcne VulgarisOintmentsAdministration, TopicalSkin AgingCosmeticsChemexfoliationDermatologic AgentsHyperpigmentationAcitretinMelanosisNicotinic AcidsEmollientsTrichloroacetic AcidKeratosis, ActinicSkin CareFacial InjuriesCarcinoma, Basal CellRetinoidsAdministration, CutaneousSkinSkin PigmentationDrug CombinationsDouble-Blind MethodAntineoplastic AgentsTreatment Outcome