A lipoma is a benign (non-cancerous) tumor made up of fat cells. They usually feel soft and can be moved slightly under the skin. Lipomas are typically painless and grow slowly, often appearing on the arms, back, or thighs. Most people have them removed only for cosmetic reasons or if they cause discomfort. These growths are quite common and can occur in anyone, though they are more frequently found in middle-aged adults. While lipomas are generally harmless, it's important to consult a healthcare professional if you notice any unusual lumps, as they can help determine the best course of action.