When the toenail grows in the flesh, it may be caused by diseases such as ingrown toenail and onychomycosis, which can be treated with medication or surgery under the guidance of a doctor. 1. ingrown toenail: usually due to the lateral edge of the toenail embedded in the soft tissues around the nail groove, resulting in foreign body irritation, and thus the inflammatory reaction. Patients can use penicillin, potassium permanganate solution and other drugs for treatment under the guidance of doctors. For patients with recurrent episodes of the disease, simple nail extraction and other surgical methods can be taken for treatment. 2. Nail groin infection: usually due to pathogenic bacteria infection and other factors, resulting in inflammatory lesions in the perinail tissue. Inflammatory lesions of the peri-nail tissue are caused by a variety of factors, including infection by pathogenic bacteria. Inflammatory lesions of the peri-nail tissue are usually caused by the destruction of the normal skin barrier, which leads to the multiplication of bacteria around the peri-nail, and the phenomenon of the toenail growing in the flesh may occur. When the toenail grows in the flesh, it may also be related to factors such as trimming the nail surface too short, etc. It is recommended that the patient go to the hospital in time for examination and treatment under the guidance of the doctor.