They start as what are called vesicular lesions, or like blisters, where they're filled with a fluid.

这往往以出水痘开始,或者起水疱,里面充满液体

耶鲁公开课 - 生物医学工程探索课程节选

There are different kinds of cell walls in bacteria but they have a rigid cell wall and our cells don't have a rigid cell wall, we have a fluid lipid like cell wall.

细菌有不同种类的细胞壁,但都很坚固,人类细胞没有坚固的细胞壁,我们有一层类似细胞壁的流动的脂类

耶鲁公开课 - 生物医学工程探索课程节选