1 month ago, I lost my virginity to a sex worker on the street in Southeast Asia. There was no kissing or fingering, but she did gave me a ha****b after touching her vagina. We then, proceed to the penetration with a condom. I did not touch her vagina the whole time. Since then, I don't have any major symptom other than my genital is a little itchy sometimes. But today I found a pimple on the base on my penis. It's like the regular pimple on your face and hurt a little when touched. Can this be STD?