Gynecomastia and chest fat are two different conditions that can affect the appearance of the male chest. Gynecomastia is the growth of glandular breast tissue in males, while chest fat is the accumulation of adipose tissue in the chest area. Gynecomastia typically results in a firm, rubbery mass beneath the nipple, while chest fat is usually soft and can be felt throughout the chest area. Gynecomastia is typically caused by hormonal imbalances, medication side effects, or medical issues, while chest fat is often caused by excess body fat. Treatment for gynecomastia may involve medication or surgery, while chest fat can often be reduced through diet and exercise.