I had protected sex about 2 months ago, and whithin the last 2 weeks ive noticed that i have a single white headed spot on the underside of my penis. It doesnt hurt, and its not moist or when i squeeze it puss doesnt come out.

Ive been to the doctor, and i was tested twice for STD's and they all came out negative. I looked all over for pictures of what it could be, but nothing seems to fit.