Sebaceous cyst and lipoma — when to remove a lump under the skin

Sebaceous cysts and lipomas are common, usually benign lumps that can be felt under the skin. Whether and how they should be removed is decided by the surgeon after assessing the lesion.

About the problem

A sebaceous cyst (epidermoid cyst) is a cyst under the skin, often with a visible opening; it can become inflamed and fill with pus.

A lipoma is a benign lump of fatty tissue — usually soft, movable and painless.

A surgeon’s assessment helps distinguish these lesions from other lumps under the skin that may need further diagnosis.

Most common symptoms

• a lump that can be felt under the skin
• a lesion that is getting bigger
• redness, tenderness or discharge around the lump
• a lesion pressed or irritated by clothing

When to see a doctor

• when the lump grows quickly or changes in appearance
• when pain, redness or discharge appears
• when the lesion is hard, does not move or you do not know what it is
• when the lump interferes with everyday life