<qa>  What is the primary lesion complex?This is a randomized, double-blind, two arm, parallel-group, vehicle-controlled, multi-center study of NB-001. The study is designed to demonstrate the safety and efficacy of NB-001 in subjects with RHL. Approximately 850 subjects who meet all eligibility criteria will be randomized in the study. Subjects will begin treatment as soon as they experience the onset of cold sore symptoms. Treatment will be applied 5 times daily, approximately 3-4 hours apart while awake. Treatment will continue until the investigator assesses the primary lesion complex as healed or a maximum of 4 days. 