Most breast lumps are not cancerous.
Symptoms of male breast cancer include lumps, changes to the nipple or breast skin - redness or scaling, skin dimpling or puckering, or nipple discharge.
What you need to do is get a clinical breast examination done by a physician. If he notices something amiss he will suggest a mammogram and USG.
It would then be possible on the basis of these reports to decide whether a core needle biopsy or a surgical excision biopsy would be required in your case.
Let us know if you have any other doubts and post us on how you are doing.
Guys can definitely have breast cancer. When I was 24 my right nipple became enlarged and if I pressed it between my fingers about 6 drops of clear fluid popped out of the little openings in the tip of my nipple. The doctor said I had a precancerous condition and urged me to have my right breast, nipple included, completely removed. I went ahead with the mastectomy, so now I have only one nipple, just the left one. The report from the surgery said I have a growth in my nipple that certainly would have become cancerous if I hadn't had the breast taken off. So now I have only one nipple, but that beats having cancer. I'm glad I had the operation. I check my remaining nipple about once a month, and so far it's okay.