Trimmer exposure. I’m reaching out!

Hello Doctor, I’m reaching out regarding a situation that occurred approximately 4 hours ago and has caused me some concern. While visiting a store, a salesman demonstrated a hair trimmer by briefly touching it to my forearm. I did not observe any visible cuts or bleeding at the time, but I later noticed a small area on my skin that may have been a ruptured pimple or follicle. Currently, the skin appears intact—there is no active bleeding, redness, swelling, or discharge. However, due to my health anxiety and concern about bloodborne infections (such as HIV, Hepatitis B/C, or HTLV-1), I’m worried about the possibility of transmission if the trimmer had been previously used on another person and had microscopic traces of blood. Could you please advise whether this scenario poses any realistic risk of infection, and whether any testing or follow-up is recommended