Safety and Efficacy of Squaric Acid Dibutyl Ester for the Treatment of Herpes Labialis

Inclusion Criteria: * Age \>18 * With clinical diagnosis of herpes labialis. * who self report having six or more episodes of herpes labialis in the previous 12 months. Exclusion Criteria: * Pregnant or lactating females. * Current or recurrent 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 immunosuppressant at time of recruitment or within past 4 weeks, except for inhaled corticosteroids for asthma. * History of malignancy (except patients with surgically cured basal cell or squamous cell skin cancers who will be eligible) * History of organ transplantation * Negative HIV-positive status determined by history at screening or known history of any other immuno-suppressing disease. * Severe comorbidities (diabetes mellitus requiring insulin, CHF (EF\<50% at baseline will be exclusionary) of any severity, MI, CVA or TIA within 3 months of screening visit, unstable angina pectoris, oxygen-dependent severe pulmonary disease * 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. * Subjects who have known hypersensitivity to Squaric acid or any of its components. * History of recent alcohol or substance abuse (\< 1 year) * Any condition judged by the investigator to cause this clinical trial to be detrimental to the patient. * History of psychiatric disease that would interfere with the patient's ability to comply with the study protocol * History of non-compliance with other therapies.