Rectal sex is inherently traumatic compared with vaginal intercourse; the vagina evolved as a pretty tough organ intended for the purpose, the rectum did not. So injury with bleeding is pretty common, probably more so the first few times.
It's hard to comment on the bumps and dots in your mouth. They don't sound like an STD, and oral sex is less risky than anal sex. The buttock bump sounds like a pimple, doesn't sound like an STD. Mosquito-bite-like bumps probably are mosquito bites. None of this sounds like HIV.
But if in doubt about any of this, see a health care provider.
Since you're just starting your gay sexuality, I'm going to give some general advice--which I hope will help not only you, but others who may read it. You have started with mixed signals as to your sexual safety. Using a condom for anal sex was good, but having sex with someone you don't know wasn't so smart. Regardless of when and where you hook up with guys, please get in the habit of condom use for anal sex, whether you are top or bottom. Most important, ALWAYS share your HIV status with anyone with whom you're going to have anal sex, either as top or bottom; and without exception insist on knowing your partner's HIV status (i.e., no anal sex with guys who won't tell you whether they are positive or not, or say they don't know). This is important even if you plan to use condoms, which can break. No person at high risk for HIV should ever have sex with another person without knowing whether or not s/he is infected and sharing that information. (There are exceptions. In much of the world, a woman who discloses her HIV infection may be at risk for abandonment, ostracism and domestic violence, even murder. But with rare exceptions, that doesn't apply to gay men.)
Finally, as a man who is going to be having sex with men, you're going to need to educate yourself about STDs and what symptoms are and are not important. Please do some research on the web, and perhaps go to a local gay service center in your area. And plan on regular testing for HIV, syphilis, and other common STDs; at least once a year and likely more often, depending on your lifestyle.
Best wishes-- HHH, MD
Vegeta: Presumably the person who did the gonorrhea and chlamydia tests examined you. If s/he didn't think the bump was important, then chill out. The chance you got herpes or HIV from a single episode of vaginal sex, no matter how "risky" your partner was, also is in the lottery-winning (or lightning strike) range. I doubt you need herpes or HIV testing (and if you do, there is no need to wait 6 months).
HHH, MD
HHH, MD
God Bless YOU
God Bless YOU
God Bless YOU
God Bless YOU