Acupoints are very fragile places where human ganglion blood vessels and qi and blood flow are concentrated. Of course, it will be red, swollen and painful when clicked. In martial arts, there is a trick called structural trick, which is specially designed to attack the vital points of human body. Don't mess around, you'll hurt your internal organs We have a legend here that a soybean can kill people. Why? By coincidence, I hit the acupoint. Hot compress can be used to relieve pain and swelling.