There is an important point in the human body, Renzhong Point, which is located in the nasolabial groove. There are certain reasons for the depression of the groove:

Because the maxillary and palatal bones develop from both sides to the middle during embryonic development, they will naturally leave "traces" equivalent to healing in the process of fusion, which only people have. I've heard of cleft palate. It is because of poor development that people with cleft palate cannot see the whole person.

Of course, I also have a hollow, and there seems to be a hollow position between people.

But if he does have any uncomfortable feelings or reactions, he can go to the hospital, which is the safest.