Yes, hitting the inside of the elbow with an empty palm can detoxify, which is an ancient physical therapy handed down by our ancestors _ _ holographic economic scrapping therapy! This is the so-called shortcut! Bleeding from the shoulder to the tip of the middle finger, or hitting Quchi point with an empty palm, will appear spots as you said. A cold is a purple-black spot. The same method will have the same effect in the posterior fossa of the knee!