PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics Concurrent systemic immunotherapy allowed if disease is stable or progressing at time of study entry after at least 8 weeks of treatment Chemotherapy: See Disease Characteristics At least 12 weeks since prior intralesional chemotherapy Concurrent systemic chemotherapy allowed if disease is stable or progressing at time of study entry after at least 8 weeks of treatment Must not have previously exceeded or will exceed on this study a cumulative dose greater than 400 U of bleomycin Endocrine therapy: Not specified Radiotherapy: At least 12 weeks since prior local radiotherapy to study lesion Surgery: See Disease Characteristics At least 12 weeks since prior local surgery to study lesion Other: At least 12 weeks since prior local cryotherapy to study lesion At least 4 weeks since prior investigational drugs or devices No other concurrent investigational study