i recently had sex with my boyfriend and i showed him writen proof from my doctor that i have no stds. a couple days after we had sex both anal and regular without a condom, he said there was a bump on the tip of his penis. but i am sure that i dont have any stds because i just got checked. what could this be? is it an std?

Anyone who has anal sex without a condom or even with a condom is inviting some pretty nasty infection in their privates or on their privates. This has nothing to do with STDs or not. It has to do with the human waste aspect of things should not be tampered with in one's colon. You can still get a swell infection even if you have a condom on as condoms are not 100% nonporous. Time to see a doctor if his bump does not go away.