small punctures in the skin.
Those repeated punctures produced a localized reaction. As the area healed, it could develop a crust and eventually leave behind a characteristic circular, slightly depressed scar.
That’s why the mark can look so different from the small scars left by many modern injections.
Why Is It Usually on the Upper Arm?
The vaccination was commonly administered on the upper arm.
For people vaccinated during mass smallpox vaccination campaigns, the resulting scar could remain visible for decades.
Over time, the mark became almost like a historical
