my boyfriend occasionally (its happened twice in the past 2-3 months) gets a small red bump/irritation on his penis right after we have sex. the first time it was right on the head, and this time it is along the side of the shaft. he is concerned that he has genital herpes, but i don't think thats it. its only 1 bump and it shows up immeditely after sex and goes away in about a week or less. i say its just irritation from the condom or something simple like that. has anyone else had this happen to them or have any ideas of what it could be? maybe its the condom we are using (i don't know what kind we were using the first time we noticed this, but it was an ultra thin one this time), maybe its too much friction, not even lubrication. do these make any sense or should we be concerned that its more serious?

thanks a lot