Can under eating cause fat on chest or is there another reason for me being skinny with man boobs (not gynecomastia)?

Gynecomastia : This is gynecomastia and usually related to hormone changes in someone your age. I highly recommend a check up by your pediatrician and possibly a breast specialist. This will most likely go away by the time puberty is complete.

Puberty hormones: Are the most common cause of gynecomastia (defined as male breast enlargement, which is what you do have). Gynecomastia can occur like yours in thin males from hormone changes, in obese males from fatty breasts, and with certain medications, endocrine tumors, and even smoking pot. Really! regardless of the cause, if it doesn't go away on its own, plastic surgery is needed and works great!

Man Boob Treatment: The formal name for this is gynecomastia. It is not caused by being skinny. Typically liposuction is used to correct it. 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.

No.: No, I do not think that “under eating” is a cause of your situation. For accurate advice, given that you feel that you do not have gynecomastia, best to be seen by your physicians who ( after history and physical examination) can make a proper diagnosis and treatment recommendations. Best wishes.

No: Heredity, and certain drugs, with obesity are leading causes.