Under normal circumstances, vertical lines on the fingers are due to the following reasons: First, when the body lacks vitamins, such as vitamin B1, vitamin B6, vitamin C, there will be vertical lines on the fingers due to malnutrition of the skin. Second, in the human body lack of trace elements, such as the lack of zinc will also have finger parts of the malnutrition caused by the appearance of vertical lines. Third, the skin relaxation and aging under the stratum corneum is too thick, the dermis is too thin, there will also be vertical lines on the fingers of the clinical symptoms and performance. Fourth, the hands are often easily infected by bacteria, viruses and fungi, and when infected, the vertical lines on the fingers will also appear and accompanied by redness, swelling, heat and pain around the skin.