You should not take out the black thorns when you see plantar warts. If you pick them off by yourself, it will not help to heal the disease and will easily cause infection. Plantar warts are often triggered by long-term friction or trauma to the feet, sweaty feet, low immunity, and walking barefoot in public bathrooms. Black thorns are the phenomenon of blood vessels protruding into the epidermis after being destroyed by human papilloma virus. The oxidation of skin repair or strong putrefactive drugs causes the bleeding inside the capillaries to coagulate and turn black. It is not recommended to treat it by yourself to avoid infection. Treatment of plantar warts can be done under the guidance of a doctor using some creams, such as vitamin A acid ointment, applied topically once a day, or opt for laser or freezing, which needs to be treated every 3-4 weeks. In addition, you can also choose the electrocautery method to remove the plantar warts completely. In the process of treatment, ensure that the feet are clean, in addition to usually exercise more physical, pay attention to rest, pay attention to diet and nutrition, no spicy and stimulating food.