7. A contagious skin disease prevalent in tropical America, caused by a spirochete(Treponema carateum) and characterized by extreme thickening and spotty discoloration of the skin.

• 品他病一种流行于美洲热带地区的皮肤传染病，由一种螺旋体引起（斑点病密螺旋体），其特征是皮肤起厚皮并有点状褪色现象收藏指正