Why do concubines in the Tang Dynasty want red spots on their lips?

Fashion makeup.

This kind of decoration was very popular in the Tang Dynasty, and poems describing this kind of decoration often appeared in Tang poems, such as "Drunk and Beautiful" and "Apricot and Beautiful". Noodles are usually stained with rouge, and some are covered with gold foil and jade feathers, just like flowers. Before the prosperous Tang dynasty, it was usually made into two points like soybeans. After the prosperous Tang dynasty, the range of noodles was expanded and the styles were richer, such as money points, apricot ytterbium and flower ytterbium. After the late Tang Dynasty and the Five Dynasties, women's facial makeup became more complicated. In addition to the traditional polka-dot flower shape, they also added bird and beast graphics, and some even pasted these faces all over their faces.