FoscarnetInjectionsPhosphonoacetic AcidGanciclovirAntiviral AgentsCytomegalovirus RetinitisOrganophosphorus CompoundsAcyclovirCytomegalovirus InfectionsCytomegalovirusRetinitisSkin Diseases, ViralOrganophosphonatesStomatitis, HerpeticCytosineInjections, IntramuscularInjections, IntravenousAIDS-Related Opportunistic InfectionsHerpes LabialisAcquired Immunodeficiency SyndromeAdministration, TopicalInjections, IntralesionalInjections, SubcutaneousInjections, Intra-ArticularRoseolovirus InfectionsOintmentsDNA-Directed DNA PolymeraseHerpes SimplexDrug Resistance, ViralZidovudine