Acrochordons commonly develop from skin on the neck and axillar region, but may be found on any region of body. Although some predisposing factors have been implicated, the definite etiology has yet to be determined. We report the case of a 46-year female patient who presented with a large mass lesion on the inner aspect of the thigh. She stated that the swelling had emerged some 20 years ago and had progressively grown since then. Magnetic resonance imaging revealed a solid lesion with no anatomic relationship with musculoskeletal structures. Taking into account the basal width of the lesion, spinal anesthesia was administered and the lesion was excised with an intact surgical border of approximately 1 cm. The resulting defect was primarily closed. A histopathologic examination led to the diagnosis of an acrochordon with a size of 20 x 14 cm. To the best of our knowledge, this is the largest acrochordon lesion with the widest base reported in the literature.