If the toenail grows into the flesh, or even if there is pus, it will need to be cut and drained, and if necessary, a nail extraction will be performed. If the toenail grows into the flesh, it may cause onychomycosis. Inguinitis is a purulent bacterial infection of the nail groove and surrounding tissues, with the causative organism being mainly Staphylococcus aureus, which may cause pus to accumulate as the disease progresses. If this occurs, surgery is required for incision and drainage; if a nail root abscess develops, nail extraction may be necessary. 1. A longitudinal incision should be made along the nail groove to incise and drain the abscess, taking care to remove the pus thoroughly without leaving any residue. 2. If the abscess is more serious and forms an abscess at the nail root, it is necessary to detach and extract part or even all of the nail, and care should be taken not to damage the nail bed during the operation.