I received my first Jynneos vaccine on August 3rd. It was the full sized dose to the back of the arm. I had a small bump and a larger area of redness that resolved in about a week. Kind of hard to say for sure as I wasn't looking at it in the mirror since it really didn't bother me.
I got the second shot on September 1 and it was the new 1/5 dosing method. It was quite red, itchy and sometimes painful in the 72 hours after. It's significantly smaller now. It almost looks more like a bug bite that I scratched a bit more than I should have. It might also stand out a bit more on my skin since I'm fair-skinned and a redhead.
I was not given a choice as to where I got the shot, only a choice of left or right forearm. Since they inject a quantity of serum in such a way as to make a bubble under the skin, and for the dose to sit in the area for a while, it's why they don't want to just give you a shot in your shoulder. The nurse didn't mention there being a scar from this method. She did tell me that they wouldn't be using a bandage and not to use one myself as it would "suck the vaccine right out of my arm." So also not being covered could also make the healing take a bit longer.
I was born in 1972 and never received a smallpox vaccination. In 2002, I did a smallpox vaccine study to see if the old vaccine that was stockpiled in the US would work. They also tested us with different dilutions of the serum to see if they could make the vaccine on hand stretch further. When they administered that they made a bunch of scratches and pokes in a small area on my shoulder. That did leave a scar. It actually looks a bit different than a lot of the ones you see on older folks or those raised in other countries. The study had us keep our wounds covered for a period of time so we wouldn't cross contaminate anyone in our social groups. (Living without children and immune compromised individuals wasn't allowed.) For all this, I got $300.
The first consent form I did on August 3rd asked about prior smallpox vaccination. I indicated the study. The staff at the county health department said they weren't considering prior smallpox vaccination as it was decided it didn't matter. When I did the paperwork for the second shot, the question had been removed.
If it matters, this was Maricopa County, Arizona (Phoenix)