If there is a vertical line concave in the middle of forehead, if it is not genetic but recently grown, and there is no discomfort on the surface, it may be the wrinkles of the skin with ageing. It is a normal phenomenon and does not require too much worry or any treatment. Pay attention to your lifestyle habits, keep an optimistic and relaxed state of mind, and control your diet. If you feel that the depression is not beautiful, you can use fat filler to make your forehead smooth, and you can also apply a beauty mask. It should be reminded that if the vertical line of the forehead is concave, along with other medical conditions, you must go to the hospital for further examination in time.