I never paid much attention to it growing up—a small, round scar on my mother’s upper arm. It was faint and easy to ignore, just part of the background of childhood.
Years later, I noticed the same kind of scar on a stranger while helping her off a train. Same spot, same shape. It instantly reminded me of my mother.
That moment stayed with me. Later, I finally asked her about it. Her answer was simple: it came from the smallpox vaccine.