Breast asymmetry is the condition when both breasts are not equal in size. In men, gynecomastia can include only one or both breasts. Unilateral gynecomastia occurs when only one breast is larger due to gynecomastia, while the other breast is typically normal in both size and shape. Bilateral Asymmetry occurs when gynecomastia is present in both breasts, although each to a different degree. The amount of glandular tissue can affect the size, shape, and location on the chest wall of the enlarged area, the size of the areolas, and protrusion and diameter of the nipples.
Unequal or unilateral gynecomastia is not an uncommon condition. It is more significant when there are very noticeable differences between the two breasts. Often in this case, individuals who suffer from extreme unilateral gynecomastia have experienced severe psychological effects and developed intense social anxiety. The large, and unequal breast may also interfere with developing intimate, personal relationships. Men who develop even mild cases of gynecomastia can suffer from low self-esteem, as well as depression.