Hi,
Malignancy in the male breast is very rare,but it could happen especially to much older men.
All the things you have mentioned are possibilities.
If your doctor has recommended removal of the lump without ordering some type of testing beforehand and you are not sure of his/her diagnosis,I would advise you to seek a second opinion preferably with a Breast Specialist who might agree with your doctor to have the lump removed or might want to further investigate this problem by ordering a blood hormone level test,an ultrasound,a mammogram or even a biopsy..
Gynecomastia is a condition usually occurring in teenage boys caused by hormonal imbalance,but it can also occur in adult men with high levels of estrogen causing glandular tissue growth.
You should tell your physician about all medications (prescribed or illegal) that you might be taking that could cause this problem
I doubt that your condition indicates breast cancer,but the best advice I could give is to seek a second opinion,just to make sure what this lump represents.
Best wishes...
A second opinion is recommended. To reassure you, breast cancer in men is rather rare. Before surgical excision, mammography and fine needle aspiration are recommended.