PRIOR CONCURRENT THERAPY: Biologic therapy: No prior melanoma vaccine No prior immunotherapy No other concurrent immunotherapy Chemotherapy: No prior chemotherapy No concurrent chemotherapy Endocrine therapy: At least 2 weeks since prior glucocorticosteroids for nonmalignant purposes No concurrent steroids Radiotherapy: No concurrent radiotherapy Surgery: At least 4 weeks (but no more than 12 weeks) since prior major surgery Other: No concurrent immunosuppressive drugs