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Do you know the true meaning of the little scar?

A lot of people have a small, round scar on their upper arm from the smallpox vaccine they got before the 1970s. This vaccine used a live virus to help the body fight against the dangerous virus that caused smallpox.

The original article states that after getting the shot, blisters show up where the injection was given. These blisters will heal over time and leave a round scar.
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