Re: Vaccination Scars?
If they were born in the 1970s or earlier, they may have scars from the smallpox vaccine.
Because smallpox vaccine has not been given since the late 1970s, those born later will not have had that vaccine or the scars from it.
Other vaccines commonly given (measles, mumps, rubella, influenza, polio, pneumonia, etc.) tend not to leave scars.