Macules are variously sized,circumscribed changes in skin color,without elevation or depression.They may be circular,oval or irregular,and may be distinct in outline or fade into the surrounding skin.

• 囊肿:为含有液体、半固体粘稠物或细胞成分的囊性皮损，一般位于真皮或更深位置，可隆起于皮面或仅可触及。