I gave unprotected oral sex to another man 4 weeks ago and took semen in my mouth. I had very mild inflammation of the glands in my throat, but that seems to be passing and other friends have similar complaints of bugs causing a sore throat. . I've noticed a very small lump on my hard palate for the last day or so. It is just a small lump that is tender (maybe due to the fact that I keep pressing it), doesn't look ulcerated and is a similar colour to the rest of the palate (red/white).
1. Does a syphilis chancre begin like this and stay non-ulcerated for that length of time?
2. Is the palate a likely place for a chancre to appear hrough giving oral?