The way we shave our hair is passed down from generation to generation. Weak children are most likely to get hairpins, so many children know that hairpins will be scraped, but many people scrape them with rice spoons. Because rice spoons are used for eating, the edges of rice spoons are generally oval in order not to scratch their mouths.
In fact, we are still using rice spoons in rural areas in recent years. We used to use rice bowls with many coins, because the rice spoons used by rural people used to be iron spoons, and things used by children easily fell to the ground. If it's a porcelain spoon, it's easy to break, but scraping with an iron spoon is easy to scratch the skin, so most of us use bowls. Some people may think it's wasteful to scrape with a bowl, so they don't use some.
No matter how healthy we are, we will get sick sometimes. Some diseases can be solved without taking medicine. We all take the best medicine. If we take too much, it will become ineffective. Because you take too much of the same medicine, your body will produce antibodies, so just like chapped skin, scraping can solve it. There is no sequelae, just scraping with a rice spoon.