How To Treat an Ingrown Toenail By Matthew J Streitz, MD, San Antonio Uniformed Services Health Education Consortium Reviewed / Revised Apr 2023 View Patient Education Indications Contraindications Complications Equipment Positioning Step-by-Step Description of Procedure Aftercare Warnings and Common Errors Tips and Tricks An ingrown toenail is incurvation or impingement of a nail border into its adjacent nail fold.