I read that certain benign bone tumors use chemotherapy.which benign bone tumors use chemotherapy as a treatment?

Benign bone tumors: I'm familiar with using curettage, bone grafting and excision for benign bone tumors, sometimes even radiation, but i haven't heard of chemotherapy being used. I would definitely welcome (and defer to) our oncology colleagues' input on this great question!

None: No benign tumors use chemotherapy. If someone is saying differently, then go somewhere else.

Generally no: Unresectable fibromatosis is often treated with chemotherapy, tho not the type you may be thinking of (hair loss, bone marrow suppression, etc). Unresectable giant cell tumors might also respond to chemotherapy, again not the typical agents. So in general no, tho there are rare exceptions.