Treatment is necessary if gynecomastia is caused by a disease or a tumor. If it is due to a disease, the disease itself will need to be treated. Breast cancer is very rare in males. Your doctor will probably be able to tell whether the lump is cancer. Lumps caused by cancer are usually not underneath the nipple, but breast tissue from gynecomastia grows in this area.
Breast cancer feels different than the breast tissue of gynecomastia.
With cancer, there sometimes is dimpling of the skin or a bloody discharge from the nipple. If there is any question that you have cancer, you will need to have a mammogram and a biopsy. This information is not intended to be a substitute for professional medical advice. You should not use this information to diagnose or treat a health problem or disease without consulting with a qualified health care provider. Please consult your health care provider with any questions or concerns you may have regarding your condition.