Do you have any other symptoms: do these itch / do you feel the need to scratch them? Do you shave off your pubic hair on a regular basis / usually?
There are several things this could be, such as Folliculitis - and you may have inflamed the situation, either by the last time you shaved (if you do, obviously), or by constantly scratching at them. Unfortunately, there are several other thing that this could potentially be. If this were me, I would dab some liquid antiseptic on at least 2 or 3 of the bumps and see how they react. Do this twice a day for 3 or 4 days - if they become more irritated, or simply do not go away after 2 weeks or so, seek Professional Medical Help.
The other thing that may help is if you consider your personal hygiene in that area: do you get a shower every morning, do you put on clean underwear after taking a shower? - that kind of thing …