The only way to know if you have cancerous lymph nodes, however, is for a healthcare provider to do a biopsy. Can deodorant cause lumps under the armpit? Deodorant doesn't cause lumps in the armpit.

The biopsy has possible risks ... If your doctor removes sentinel lymph nodes from your armpit, you may develop swelling in your hand or arm. If they take sentinel lymph nodes from your groin, you may ...

A lymph node biopsy is often done during your breast cancer surgery ... We may need to remove most or all of the lymph nodes in the armpit. Your doctor will talk with you about the next steps. When ...