Keratolytic AgentsTretinoinAcne VulgarisDermatologic AgentsAdministration, TopicalFox-Fordyce DiseaseLentigoNaphthalenesSodium Pertechnetate Tc 99mOintmentsSkin AgingCosmeticsClindamycinChemexfoliationHyperpigmentationAcitretinMelanosisNicotinic AcidsEmollientsTrichloroacetic AcidKeratosis, ActinicSkin CareFacial InjuriesCarcinoma, Basal CellRetinoidsAdministration, CutaneousSkinSkin PigmentationDrug CombinationsDouble-Blind MethodAntineoplastic AgentsTreatment Outcome