A lipoma is a benign tumor made up of fatty tissue. They are usually soft, movable, and painless, often found just beneath the skin. Lipomas can occur anywhere on the body but are most commonly seen on the trunk, shoulders, and arms. They grow slowly and are generally harmless, requiring no treatment unless they cause discomfort or cosmetic concerns. While the exact cause of lipomas is not fully understood, they may have a genetic component, as they can run in families. Diagnosis is typically made through a physical examination, and imaging tests like ultrasound or MRI may be used if necessary.