Breast mass is a very common condition. It affects females more than males.
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A breast mass is distinct from the other breast tissues because it is of a different consistency. Breast masses can be felt on examination. Any mass felt in the breast should be taken seriously. Tissue from it needs to be taken out and examined in the lab for tissue diagnosis and proper treatment.
I need to emphasize that the breast should be examined every month immediately after menstruation and any mass, even if it is a suspicion needs to be reported to the doctor.
You must have heard of breast cancer, many of them start as small masses but then progress to cancer with time.