Skin seeds, white fresh peel and so on. Yellow Dragon Shelling and Groundnut and White Fresh Peel in soup can treat stubborn skin diseases. The root of piercing stone is yellow, the skin is very characteristic, there are many layers of yellow skin, can be taken off one layer by one layer, such as thin like paper, it is easy to take off, so it is also known as the nine layers of skin, and some places called Huanglong deshelling.