There is no clear indication as to how long the topical Rejuvenate solution needs to be left on. However, the general clinical recommendation is 10 to 15 minutes. Specific need to follow the doctor’s advice. Rehabilitation New Liquid is a proprietary Chinese medicine composed of American cockroach extract, which has the efficacy of promoting blood circulation, nourishing yin and promoting muscle growth. Clinically, it is mainly used for the treatment of gastric pain and bleeding caused by stasis and blood obstruction, yin deficiency, gastric ulcer, duodenal ulcer, consumption, tuberculosis and other diseases; it can also be used for the treatment of wounds such as gold sores, burns, burns, trauma, fistulas, bedsores and other wounds. Patients who are allergic to the drug composition of Rehabilitation New Liquid are prohibited from using it. Patients suffering from the above mentioned diseases, need to use medical gauze soaked in liquid applied to the affected area, generally can be applied for 10 to 15 minutes. The specific need to follow the doctor’s instructions for the use of drugs.