This is chicken breast, caused by calcium deficiency. I didn’t realize it before because you didn’t take much care of your body when you were young. Only when you grow up and realize that you are beautiful do you start to observe yourself. Pay attention to calcium supplements, milk, beans, bones, etc. It’s best not to use too much oil. Eat a little meat with every meal and bask in the sun.
Kneeling upstairs, I realized for the first time that the ribs are used for this. I am a man and my ribs also protrude. If my breasts are bigger, I wonder if the ribs will come out directly.