DISEASE CHARACTERISTICS: Histologically confirmed melanoma metastatic to regional lymph nodes with a clinically palpable mass Must have clinical evidence of the following: Metastases in 1 nodal site All other nodes microscopically negative No intransit metastases No extranodal extension OR Metastases in more than 1 nodal site More than 1 positive lymph node in a single site Intransit metastases Extranodal extension Must have undergone complete resection of tumor, measuring at least 2 cm in diameter, within the past 6 weeks No distant metastases