hi, i am 16, a virgin, but i recently got a blowjob off of my ex-girlfriend 2months ago, but recently (about 3/4 weeks ago) i noticed some small red spots on the head of my penis, i decide to leave them until now as i thought they were harmless and just some sort of weird stage of puberty, these spots are painless, not bumpy and do not smell, i have no skin conditions, but my ex-girlfriend has had 3 sexual partners before we went out, i am unsure if she had unprotected sex and may have caught an STI and passed it on to me, any idea's thanks for your time, please reply asap