Dear aaaaaa, Male breast cancer is rare, but one out of every 150 cases of breast cancer involves a man, usually in men over 60 years old. Although a painless breast lump is the most common sign, most breast lumps in men are benign (non-cancerous) and are related to some other cause. The first step in determining what the cause might be in your situation would be to have it examined by a health care professional.
You should see a physician to be certain that this lump is not breast cancer. Men do get breast cancer, although not in large enough numbers to have an impact on securing better treatment methods or finding a cure. I am sorry you are faced with this concern. As you now know, the anxiety associated with such a discovery, can be overwhelming, and the treatment options rather skewed. Hopefully, the lump is nothing.