1. Dimples are caused by personal genetic factors, and dimples are hereditary. Natural dimples may also be caused by defects in the cheek muscles. Sometimes defects are not always a bad thing, and often contribute to the value of beauty.

2. Dimples are recessive inheritance. Recessive inheritance means that the recessive gene in a pair of genes must be paired before the traits determined by it will be expressed. Dominant inheritance means that in a pair of genes, Dominant genes do not need to be paired. As long as there is one dominant gene, the traits determined by it will be expressed. For example, beauty points and double eyelids are dominant inheritance. It can also be done the day after surgery.

3. Dimples can be divided into three types: round, oval and fissure-shaped. Some scholars have conducted surveys and found that most of them are located on the cheeks, and are also more common around the corners of the mouth, with relatively few on the zygomatic and chin areas.

4. Some acquired dimples are formed by muscle activity under the skin. Most muscles in the human body are firmly attached to bones by tendon fibers, such as chest muscles and lower limb muscles. The facial expression muscles are an exception. They are directly attached to the facial skin. When the facial muscles contract, they will affect the facial skin, causing various wrinkles on the face, producing expressions of joy, anger, sadness, and joy.

Extended information:

1. When making the expression "smile", the muscles on the face affect each other, creating a depression, which is called a "dimple". Some people also call it "Laughing Nest", or it has another name "Pear Nest" due to its different location and size. Not everyone has dimples, and people with dimples may have different shapes, heights, and depths.

2. Whether you have dimples or not is also related to the development of facial muscles. People who have less full smile muscles and less facial subcutaneous fat will generally not have dimples when they smile. Of course, dimples can also be created through surgery.

3. Dimple plasty is especially suitable for those with fuller cheeks. Embellishing two dimples can make the appearance sweeter. For those with thin cheeks, especially those with an "inverted triangle" face shape, adding dimples will make the appearance look sweeter. Very inconsistent. The method of fixing the dimple is very simple. Draw a horizontal line from the corner of the mouth to the outside, and draw a vertical line from the outer corner downward. The intersection of the two lines or slightly inside and above the intersection is the fixed point of the dimple.

Reference: Baidu Encyclopedia-Dimple