After the scab is not to touch the water, because the scab is the human tissue after the injury, the local surface blood exudation and the formation of blood clots, and gradually by the fibroblasts, and other lymphocytes composed of granulation tissue gradually replace the blood clots, and wait until the granulation tissue full of wounds, the top will gradually have a layer of epithelial tissue covering the granulation tissue, and finally achieve the purpose of skin healing. In the process of scabbing, the epithelial tissue is often not fully grown, if you take the risk to touch the water, no skin barrier is easy to cause: first, infection; second, the scab granulation tissue is still very brittle, can not resist the infiltration of water, after a long time will soak rotten, or even fall off, will affect the wound healing, will also cause infection. The scab is not to touch the water, it is best to wait for the scab to fall off and then consider touching the water.