Nails growing into the flesh is called ingrown nails. Ingrown nails are caused by improper nail trimming, mechanical injury, etc. and need to be analyzed specifically. 1. Improper nail trimming: If the patient trims the nail plate too deep or too short, this will lead to the nail plate at both ends of the side angle sharp, the nail plate will be like a thorn into the soft tissue around the nail, resulting in ingrown nails. 2. Mechanical damage: if mechanical damage to the soft tissues around the nail and the nail plate friction each other, resulting in local inflammatory reaction of the soft tissues, swelling, increase the package of the nail plate, in the long term will lead to the nail plate ultimately pierced into the soft tissues, resulting in ingrown nails. If the patient has an ingrown nail, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor for appropriate treatment.