Ever since like I was 13 (or started puberty), I've had little small yellowish bumps in patches on my lower shaft of dick, that aren't noticeable until I'm hard. Is this an STD (I'm a virgin), or a different disease, or just pubic acne? Sometimes I can squeeze it and zit-like stuff comes out. (sorry if that's gross.) I've been wondering since then, when I was just a young teen I freaked out about it but there's no pain, no other rashes or whatever. Do I just not wash that area well enough? I have bad acne other place but usually it's inflamed so it's bright red.