FoscarnetPhosphonoacetic AcidGanciclovirAntiviral AgentsCytomegalovirus RetinitisOrganophosphorus CompoundsAcyclovirCytomegalovirus InfectionsCytomegalovirusOrganophosphonatesSkin Diseases, ViralRetinitisCytosineStomatitis, HerpeticVirus ReplicationDrug Resistance, ViralHerpes LabialisAIDS-Related Opportunistic InfectionsAcquired Immunodeficiency SyndromeHerpes SimplexAdministration, TopicalComparative Effectiveness ResearchZidovudineDNA-Directed DNA PolymeraseTreatment OutcomeRoseolovirus InfectionsOintmentsInterferonsReverse Transcriptase InhibitorsDrug Resistance, MicrobialViral Plaque AssayHerpesvirus 6, Human