What is a little depression in the middle of forehead?

This is not a depression, but a bone bulge. In his early years, the Lord ran around and worked hard, but he had extraordinary achievements in life. This man's bones are not full and flat enough. There is also a piece of this kind of bone on the left, which looks better than him. Zuo's failure in the imperial examination in his early years became a dull pain in his life. Although he was appreciated by celebrities in his early years, before he was 30, he just read, taught, helped others with housework and put on a cloth. It was not until I was in my thirties that I really made my mark in officialdom. Because once (24 years old) fell and hit the corner of the bed, his forehead swelled up quickly. When I was looking in front of the mirror, I unconsciously pressed a button with my finger, and the effect was similar to that of Crystal. The two pits are still moving, not the skull is sunken, but the swollen part is sunken. The difference is that the area around my injured part was very red at that time, unlike the normal skin color in Crystal photos. After a few hours, the edema became substantial, that is, it was difficult to feel, and it was no longer a pit state. Hyaluronic acid will not be injected into that position. Even to disguise the wound, it will not be injected there, because although the shape of hyaluronic acid can be changed by pinching in a short time after injection, the solidification time of this colloidal object is very short (a few minutes). In that case, Crystal needs to take photos quickly, risking that the two pits will not disappear for three months. Even if the pit can be leveled, there will be an unnatural big lump-hyaluronic acid can not be taken out. But physiological saline can achieve this effect. The medical term is depressed fracture of skull. If the depression reaches 1cm, surgery must be performed. The operation is relatively simple. Clean up the bone residue and find a bigger one and put it back. Sometimes it's hard to remove. Just make a hole next to it and pry up the sunken one.