I am a male. I had my first sexual encounter with a middle age female sex worker of Asian decent. Right before the encounter I had trimmed my pubic hair. I received unprotected oral sex followed by protected vaginal sex.

2 or 3 days after the encounter I noticed a small bump on the right of my penis shaft. I scratched it. It came off. The skin started to heel and there was scabbing.

The small bump was 0.3cm in diameter. It was on the skin of the penis and thus it moved when I moved my penis skin. It appeared to be spherical. I was about just a little lighter than the color of my skin.

What was this?