yaws 
(yôz)
(yôz)pl.n. (used with a sing. or pl. verb)
A highly contagious tropical disease that chiefly affects children, caused by the spirochete Treponema pertenue and characterized by raspberrylike sores, especially on the hands, feet, and face. Also called frambesia.
[From American Spanish yaya, sore, from Carib yaya, disease.]