If you grew up in parts of Asia, Africa, Latin America, or Eastern Europe, you may have noticed a small, round scar on your upper arm. It’s often about the size of a pencil eraser, slightly indented, and lighter than the surrounding skin.
For many people, it’s just always been there. Over time, you may have wondered where it came from—or someone may have asked about it.
The answer is simple: it is often the result of an early childhood vaccination.
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