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Are you thinking of smallpox vaccination scars?

https://www.verywellhealth.com/smallpox-vaccine-scar-7096798

That's something different. The scars I'm referring to were shaped like two half-disks facing each other.

Edit: I asked around and nobody seems to know what I'm talking about. Seems either it was a local peculiarity or a misremembered childhood.

No, I remember getting a vaccine that way, and it was different from the smallpox vaccine which was a bunch of little needles that left a scar. I got it in elementary school -- I want to say 2nd grade. I don't think the spray thing left a scar.

I have one of those, actually. Looks like someone put a cigarette out on my arm there.

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