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A tumor is a scary-sounding mass that forms when cells divide too much. But don’t panic, many tumors are benign—meaning they’re not cancerous.

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A lipoma is a soft movable lump of fat under the skin. They are usually harmless, but it’s important to know what they feel like to rule out other causes of lumps.

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An osteoid osteoma is a small, noncancerous tumor of the bones. It often affects leg bones or the spine but can affect any bone. They are usually found in young people. Many osteoid osteomas disappear on their own, but some may require surgery for removal.

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