I received unprotected oral from a prostitute. About a week and a half later I found a small red spot on my penis shaft. It never got any bigger than 2mm-3mm in size. It faded after about a month. I have never had a spot like this on my penis - it was under my circumcision scar and nowhere near the base.
Can the primary syphilis sore present like this? It never ulcerated or looked anything like the pictures of sores I have seen online.