Double-blind, Vehicle-controlled Study of the Efficacy and Safety of SADBE in Subjects With Recurrent Herpes Labialis

Inclusion Criteria: * Age ≥18 * Clinical diagnosis of herpes labialis, which may be made at the screening visit based on the patient's self-reported history of symptoms. An active herpes labialis outbreak at the time of entry into the clinical trial will neither be required nor will be an exclusion criteria. * Self report having four or more episodes of herpes labialis in the past 12 months Exclusion Criteria: * People that have had treatment with anti viral therapy within 2 weeks before sensitization dose. * Pregnant or lactating females. * Current or recurrent non-herpetic infection or any underlying condition that may predispose to infection or anyone who has been admitted to the hospital due to bacteremia, pneumonia or any other serious infection. * Therapy with glucocorticoid or immunosuppressants at time of recruitment or within past 4 weeks, except for inhaled corticosteroids for asthma or topical steroids in sites other than face. * History of malignancy (except patients with surgically cured basal cell or squamous cell skin cancers) * History of organ transplantation * HIV-positive status determined by history at screening or known history of any other immunosuppressive disease. * Severe co-morbidities (diabetes mellitus requiring insulin, CHF (EF\<50% at baseline will be exclusionary) MI, CVA or TIA within 3 months of screening visit, unstable angina pectoris, oxygen-dependent severe pulmonary disease * History of exposure to squaric acid or squaric acid dibutyl ester. * Known hypersensitivity to DMSO * Any condition judged by the investigator to cause this clinical trial to be detrimental to the patient. * Subject is currently enrolled in another investigational device or drug trial(s), or subject has received other investigational agent(s) within 28 days of baseline visit. * Previous or current participation in a clinical trial of SADBE to treat herpes labialis.