Nails with barbs may be caused by physiological factors such as dry skin, and secondly may be related to hand eczema, trauma and other diseases. 1. Physiological factors: If the skin is too dry, it may cause the epidermis to buckle, which will lead to the condition of long nail barbs. 2. Hand eczema: mostly manifested as fingers, palms and the back of the hand and other places such as peeling, cracking, blisters and other symptoms, some patients will have long nail barbs symptoms. Its cause is more complex, may be hormone levels, genetics, allergies and infections and other factors. 3. Trauma: If the nail is traumatized, it may cause the local epidermis to be torn, which will lead to the appearance of barbs. There are many causes of nail barbs, and after eliminating physiological factors, it is recommended that patients seek medical examination to clarify the cause of the problem.