Lumps can form under the skin for many reasons, including cysts or swollen lymph nodes. Often they don’t require treatment, but if they change in size or appearance, contact a doctor for an exam.

A lump on the areola, or area around the nipple, can have numerous possible causes. A lump can be a local infection, a breast hematoma, sebaceous hyperplasia, or Paget’s disease of the nipple.

Causes of a lump on your chest can include a cyst, abscess, lipoma, or benign tumor. A doctor can diagnose the lump with imaging tests, and if they find anything, they can recommend treatment. When ...