For a long time, for allergy we mainly look for the cause externally. We looked for allergens, from the inhalation group to the food group. We thought that it was something we ate or something we touched that caused the recurring skin allergy. But from clinical observation, we found that many allergies are not caused by external causes, but may be caused by internal problems. For example, some patients may say, “I eat very lightly, I don’t stay up late, and I never eat anything allergic or spicy, but I still have recurrent allergies. Experts deduce that there is a possibility of gastrointestinal intolerance, which leads to eating a lot of things that may cause allergies. Helicobacter pylori may be the culprit. Experts are divided on this bacterium. Some experts believe that he is a normal host and does not pose any harm to the human body. But there are other experts who advocate its elimination. And there are many examples to prove it! For example, Prof. Feng Aiping of Wuhan Union Medical College Hospital had patients who tested positive for H. pylori undergo anti-H. pylori treatment, and many eczema, hives and other allergy problems were solved. That’s why Professor Feng advocates elimination. Professor Feng has a theory that H. pylori is active in the body and produces a lot of toxins, causing damage to both intestinal mucosa and forming leaky gut syndrome, where bacteria in the gastrointestinal tract enter the blood tissue fluid in the body through the broken intestinal mucosa, leading to various diseases. So it is advocated to eliminate it. Probiotics should be supplemented in time after killing H. pylori. Antibiotics are mainly used to kill Helicobacter pylori, and antibiotics will kill other beneficial bacteria in the gastrointestinal tract at the same time. Therefore, after anti-H. pylori treatment, probiotics should be supplemented in time. To restore the damaged intestinal flora.