Lumps and bumps are part of life, but when should you worry? Is a cancer lump soft or hard? What’s this bump behind my knee? Get answers to these and your own questions from Mark LiBassi, MD, general surgeon, Chestnut Hill Surgical Associates. Learn about cysts – the most common cause of bumps—and where they are likely to show up. Find out the characteristics of not-so-serious lumps and what signs may indicate a more serious problem. Free! Registration required. Call 215-753-2000.