Antiviral Agents/administration & dosage; Antiviral Agents/therapeutic use; Herpes Labialis/therapy; Herpesvirus 1, Human/drug effects; Stomatitis, Herpetic/therapy; Viral Load/drug effects; Acyclovir/administration & dosage; Acyclovir/therapeutic use; Administration, Oral; Administration, Topical; Adult; Chronic Disease/therapy; Cidofovir; Cytosine/administration & dosage; Cytosine/analogs & derivatives; Cytosine/therapeutic use; Drug Resistance, Viral; Foscarnet/administration & dosage; Foscarnet/therapeutic use; Herpes Labialis/complications; Herpesvirus 1, Human/isolation & purification; Herpesvirus 1, Human/physiology; Humans; Hyperthermia, Induced; Infusions, Parenteral; Organophosphonates/administration & dosage; Organophosphonates/therapeutic use; Recurrence; Stomatitis, Herpetic/complications