Yaws is a chronic infectious disease caused by the bacterium Treponema pallidum pertenue. It primarily affects the skin, bones, and joints, leading to painful sores and lesions. The disease is most common in tropical regions and is transmitted through direct skin contact with an infected person. The symptoms of yaws typically begin with a small, painless sore that can develop into larger lesions over time. If left untreated, yaws can cause significant disfigurement and complications. Treatment usually involves antibiotics, such as benzathine penicillin, which can effectively cure the infection and prevent further health issues.