Traditional Culture Encyclopedia - Hotel franchise - Why do China people have scars on their arms?

Why do China people have scars on their arms?

In China, this is a scar left by people after smallpox vaccination.

The doctor injected the child with a needle, and the patient's immune system began to work and gained immunity to the virus. Like smallpox.

Later, the place where the vaccine was injected was infected, which caused the injection site to scab and scar.