If your fat content is higher than 25%, the main problem is the accumulation of chest fat, whatever your breast type from 1 to 7. It is sometimes called pseudogynecomastia or false gynecomastia. You should burn fat and slimming up to 10% fat and build chest muscles until you get rid of this problem completely. If your fat percentage is less than 20% and you have type 3 to type 7, unfortunately it may be genomastia and you will need to consult a doctor of glands and hormones. And of course there are solutions I will mention to treat Gino without surgery.
The only solution is to burn your entire body fat up to 8-10% fat and you will find chest fat has completely disappeared. And of course, the upper and lower chest muscles should be built to eliminate any slouching of the skin or nipple after slimming. Slimming without iron exercises will give you a weak, flabby appearance, a slender neck and narrow shoulders.