Part 1: patients with a melanoma larger than 10mm or with cutaneous metastasis Part 2: stage III melanoma patients who shall undergo a regional lymph node dissection Part 3: retrospective study of patients who underwent a sentinel node procedure Part 4: stage IV Patient achieves of inoperable melanomas the stage(stadium) III or IV that must receive in treatment(processing) a chemotherapy (by the dacarbazine or by the cisplatin or by the inhibitor of B-raf) and carrier of at least two cutaneous metastases