ABSTRACT: The chief causes of ingrown toenails are trauma, incorrect toenail trimming, and tight footwear. Conservative measures, which include decreased activity, warm soaks, antibiotic therapy, elevating the edge of the impinged nail, debridement, or removal of the corner of the toenail containing the spike, may relieve moderate inflammation and infection. For patients who have severe impingement with acute infection, partial or complete nail avulsion is the treatment of choice. If avulsion is followed by recurrent infection, partial or complete ablation of the nail matrix may become necessary after the infectious process has resolved. Teach patients to trim their toenails straight across and not to curve them toward the lateral margins.