Yaws disease is a poverty-related chronic skin disease that affects mainly children below 15 years of age (with a peak between 6 and 10 years). It is caused by the bacterium  is a Treponema pallidumm subspecies pertenue and transmitted by skin contact. Yaws disease mainly affects the skin, but can also involve the bone and cartilage. The organism that causes yaws is closely related to the one that causes syphilis. Early detection and treatment can avoid gross disfigurement and disability which occur in about 10% of cases.