RecruitingProcedureExcision of Lymph Node Trial (EXCILYNT) (Mel69)The purpose of this study is to find out if removing only the cancerous lymph node (known as a lymph node excision) is effective at preventing cancer from coming back in the same area of the lymph node excision. The study team is also trying to find out the side effects of this type of surgery and how much the surgery impacts quality of life. In order to be eligible for this study, participants must have been diagnosed with metastatic melanoma and have one detected cancerous lymph node by imaging (CT/PET scan) or clinical examination, and are a candidate for lymph node excision.