Yaws is said to be a tropical infection of the skin, bones and joints caused by the Treponem pallidum pertenue a category of spirochete bacterium. It presents itself with a round and hard swelling of the protruding skin which could be of 2-5 centimeters in diameter. The epicenter of the lesion may burst open to form an ulcer. This initial skin lesion typically heals after three to six months. After weeks to years of the initial symptoms of the infection, the joints and bones may become painful and brittle, fatigue may develop, and new skin papules may appear. The skin on the palms of the hands and the soles of the feet may become thick and break open. The bones mostly of the nose may become misshapen. After few years or more, large areas of skin cell necrosis with subsequent scarring on the skin may occur.