Is Biopsy Standard for a Lipoma?

There's a grape-size lump at about 10:00 halfway up my lower leg. My leg aches frequently, but the lump is non-painful, soft, doesn't move but the skin moves over it easily. It sinks into my leg and is hard to find when I relax the muscles, but pops out easily and visibly when my muscles contract. The doctor diagnosed it off-handedly in about as "probably a lipoma." A surgeon is going to cut it out in his office. Is a biopsy standard on a "lipoma"? Should I even worry about that or does that diagnosis sound AOK and pretty common?