The sunkenness under the eyes is usually caused by the following reasons: First, the atrophy of the adipose tissue in the orbits, which has a lot to do with aging factors, long-term malnutrition, and excessive wasting. Strengthening nutrition can improve the situation, if not, the appearance can be improved by orbital fat filling surgery. Secondly, dehydration is common in hot summer climate. Insufficient water intake in a short period of time and too much evaporation due to sweating and other reasons will lead to dehydration of the body and volume contraction of the orbital contents, making skin depression below the eyes. Third, inflammation in the orbit leads to the formation of local scar tissue, followed by contraction of the scar, which has a pulling effect on the skin of the eyelid area, forming a local depression.