RATIONALE: Drugs used in chemotherapy, such as dacarbazine and cisplatin, work in different ways to stop tumor cells from dividing so they stop growing or die. Complete metastasectomy may be an effective treatment for metastatic melanoma and may improve quality of life and help patients live longer and more comfortably. It is not yet known whether complete metastasectomy is more effective than chemotherapy in treating stage IV melanoma.