The apple muscle, which sounds like the name of a muscle on the human body, is actually not a muscle, but a protrusion on both sides of the middle of the human face, equivalent to the cheekbone position. Some people have this protrusion very obvious, others do not. The apple muscle gives people a lovely feeling when they smile because of the protrusion of the cheekbones, so it is now fashionable to have apple muscle, and many people ask to have their apple muscle made bigger, thinking that it looks good. The full shape of the apple muscle includes the skin, subcutaneous fat, facial expression muscle and the front of the cheekbone and part of the upper jaw bone. Although some people have thicker skin and muscles, it is not enough to make their apple muscle more developed than others. So why do some people have large apple muscles while others have small ones? The main factors that contribute to this difference are the amount of subcutaneous fat and the different sizes of the cheekbones. First of all, there must be a slightly protruding cheekbone as the foundation and a certain amount of subcutaneous fat, the facial expression muscle contraction, so that the subcutaneous fat tissue lifted, superimposed on the already high cheekbone to form the apple muscle that we can see from the appearance. The facial expression muscles that can make the fatty tissues of the face lift up to create the apple muscle include: zygomaticus major, zygomaticus minor, upper lip square and the laughing muscle. The first three muscles contract to move fat upward, and the last muscle moves these tissues to the sides. When a person smiles, the facial expression muscles lift the fat and skin tissues upward to form the apple muscle. The degree of beauty of the size of the apple muscle deteriorates with age. This is mainly because, firstly, as the subcutaneous fat thins with age, the apple muscle will no longer be as plump. Secondly, as we age, the above expression muscle gradually relaxes and increases in length, and the fatty tissue that makes up the apple muscle also sags. The combined effect of these two factors makes the entire apple muscle smaller in size and shifted downward. The downward shift and decrease in volume of the apple muscle will deepen the nasolabial folds and cause the facial expression of aging. In order to preserve the volume of the apple muscle and avoid sagging, the youthful beauty of the face should be preserved. Care should be taken not to overstretch the facial expression muscles to prevent the apple muscle from sagging. For example, avoid facial massage movements that stretch the expression muscles, do not laugh too often, and do not make excessive facial expression movements too often. Do not remove the front of the cheekbone during cosmetic surgery to preserve the base of the apple muscle. Do not remove the subcutaneous fat from the apple muscle during facial liposuction. Avoid damaging the facial expression muscle when removing wrinkles, etc.