Each scraping treatment should not exceed 30~40 minutes (refers to scraping with a slowly moving flat patch). The first curettage time should be shortened appropriately. People who are physically weak or weak shave for less than 20 minutes. The time interval between two scrapping of the same part is 5~7 days. The principle is that there is no spot on the skin, and the hand model can be scraped for the second time without pain. The speed of scraping is not directly related to physical condition, condition, scraping position, color depth and scraping times.

The length of scraping treatment: people who are weak and easy to scrape can stop scraping as long as the pain is relieved. People with strong constitution can stop shaving until there is no new rash. If it is in a place where it is not easy to erupt, it can be stopped as long as the pores are slightly opened. In areas with nodules and muscle tension and stiffness, as long as the pores are open or the local nodules are slightly soft, muscle tension and stiffness can be relieved. Head scraping treatment can stop scraping as long as there is local heat. Scraping in various parts of the face can be stopped for about 5~ 15 minutes according to the skin condition or local heat sensation.