How would a guy know if they have gynecomastia or just fat breast?

In general...: Gynecomastia is a small, firm, painful, localized inflammatory mass located under the nipple in men, and may be located on only one side. Fatty breast findings would be a generalized soft fullness diffusely across the chest on both sides of the chest.

By feel: Men with true gynecomastia usually have easily palpable or felt breast tissue. It's firmer than fat .Many young men have a mild case of gynecomastia, with only puffy nipples. Others have a more serious case. Most require surgery for correction, even mild puffy nipples. See my webinar on youtube - search dr. George pope. Or visit www.Gynecomastia.Org, a great forum.

Male Breast Reduct: Both descriptions would fall under the general heading of gynecomastia. . Typically liposuction is used to correct gynecomastia. If there is also a lot of loose skin often this is also removed. Occasionally if their is firm redundant breast tissue it is surgically removed. See a board certified plastic surgeon.