Bumps under the armpit, commonly enlarged lymph nodes, can have many causes. It may be caused by breast enlargement, secondary to enlargement of the lymph nodes, and the patient may also experience painful discomfort. Malignant tumors of the breast also tend to metastasize to the axillary lymph nodes on the affected side, manifesting as axillary masses, and may also present with fused enlargement and upper extremity discomfort. The most common occupational lesion in the axilla is the parametrium, which is a congenital developmental abnormality that may manifest as localized nipple changes and even nipple overflow and regular breast swelling and pain, and should be surgically removed. Parammary glands can also become hyperplastic and recurrent, which can also affect the patient’s daily life and work.