A sesamoid bone can occasionally be found under the interphalangeal joint of the hallux. These had anatomical variants and usually remain asymptomatic, it is uncommon for symptomatic cases of painful plantar keratoses or irreducible dislocation of interphalangeal joint of the hallux with incarcerated sesamoid. While the latter has a few cases, the former has not reported in Korea. We experienced a rare case of intractable plantar keratoses due to interphalangeal sesamoid bone of the hallux which may reqire excision.