After randomization, participants will undergo surgery with wide local excision with either 1cm or 2cm margins. The margin will be based upon the previous biopsy site or area of pigmentation. The skin and subcutaneous tissue (down to fascia) will be resected. Closure considerations may require removal of additional tissue for non-oncologic purposes. As per standard of care, sentinel lymph node biopsy will be performed using a dual tracer technique (technetium radiolabeled sulfur colloid and isosulfan blue) with or without lymphoscintigraphy.
