Paronychia is a purulent infectious disease formed when the nail embeds into the flesh. If the infection is in the purulent stage, it can be appropriately treated at home. After disinfection with iodine, use a needle to puncture and clean out the pus and blood. If the paronychia infection is severe, it is advised to visit the dermatology department of a formal hospital for a minor surgery. This disease has a tendency to recur. It can be permanently resolved by removing the nail and performing a forced correction on the affected area. To prevent recurrence, try not to wear shoes that are too tight and avoid prolonged walking, as the disease is related to one's walking posture and footwear.