Answer:
First of all benign tumors pose little health risk, so a biopsy may not be necessary depending on the type of tumor. (Case in point, a mole is a type of benign tumor.) Second, to answer the question, biopsies usually include taking a small part of the fat, tissue or cells and analyzing it for any diseases, including tumors. So the procedure might include cutting off some skin, or in this case, fat from the body.