The cause of a pilonidal cyst is unclear, and treatment is still under debate. In Korea, the incidence of this disease is lower than that of Western countries, and it has often been misdiagnosed as a simple abscess. When pilonidal cysts are diagnosed, the principle of treatment is not to leave a residue, and a wide excision is needed to reduce the recurrence rate. This paper introduces a wide excision technique using Indigo-carmine dye to minimize the recurrence of a pilonidal cyst.