For patients with lumbar disc herniation, if you choose to apply herbal medicine externally, most of the external application time is about 12 hours for such patients. This is because most of the Chinese herbal medicines need to be absorbed through the skin, and the skin is very slow to absorb the effects of Chinese medicines, and most of them need to go through a long process before they can be effectively absorbed. In addition, it is also necessary to adhere to the treatment. Generally, the course of treatment for this kind of Chinese medicine is around 1-2 months, if the course of treatment is too short, there is a possibility that the corresponding curative effect will not be achieved. In addition, the external application of Chinese herbal medicine is very important, generally most of the Chinese herbal medicine to choose some blood circulation, remove blood stasis, liver and kidney to external application, so as to play a corresponding therapeutic effect, but there is a point, if in the process of external application, the skin allergic reaction, generally need to stop external application. This allergic reaction may be due to the irritation of the drug on the one hand and the patient’s allergic constitution on the other hand, therefore, for this kind of patients try not to choose the external application of Chinese medicine for treatment.