I have a pimple on my penis

Patient: I noticed a pimple on my penis today, but im a little worried, what if its not a pimple? yesterday i went for a massage (it was very oily) after the massage the girl offered to give me a hand job for some extra money, even if i refused several times she still touched it several times. should i be worried? could it be STDs?

Symptoms: Pimple on my penis