What Is B-Cell Lymphoma? B-cell lymphoma is a cancer that forms in your white blood cells called lymphocytes. These cells are made by your lymphatic system, which plays an important role in immunity.

Painful armpit lumps are often due to a swollen axillary lymph node under the armpit. This is usually a sign that the body is fighting an infection, but it can sometimes indicate cancer.

The specific treatment course and prognosis for T-cell lymphoma depends on the subtype — of which there are many — and how advanced the cancer is. Hodgkin lymphoma involves a type of cancer ...