Mine is from the smallpox vaccine that I got somewhere in the mid to late 1950’s. It was smaller then, but it grew as I did. For many years I had to carry my little yellow vaccine record along with my passport, because I wouldn’t be allowed back in to the US without written proof of my small pox vaccination.
My TB tests were done with a bubble of liquid on the skin of my lower inner arm that was then scratched with a needle and then checked some days later. As they got fancier, it was done with a glass vial that both applied the liquid and scratched the skin with those prongs at the same time.
My polio vaccines (at least the ones I remember) were the sugar cube type. As I recall, the cubes looked slightly pink.
For many years I had a discolored patch on my arm where I was given my Typhoid vaccine. We lived in South America and it was common there so we had to get the shots, which consisted of a series of three injections just under the skin and resulted in a large, red, painful area. We also had to get Yellow Fever and Cholera.
I also remember the doctor making house calls to give me a penicillin shot in the gluteus maximus – now that shot hurt like nobody’s business.