First, what they are: if the small bumps on your penis are dome topped, with a color similar to the color of the skin or even lighter and situated on the head of your penis in concentric rows, then they are probably pearly penile papules. This is a skin condition which affects only men and which is most frequent in men of 20 or 30 years, while also affecting young boys and older men. Pearly penile papules will most often diminish in time, so that they can completely disappear after a few years.
Now that you know what they are, you are probably curious to know how you got them. Well, pearly penile papules is not a STD, so you could not have taken it from one of your sexual partners. Also, it is not a contagious disease, so you could not have taken in from anywhere in fact. In addition to that, there are clear evidences that this condition is not even genetically transmitted, so you have not taken it from your father either.
The truth is that those little bumps are produced by your body, more accurate by your skin. Yes, even though it may be hard to believe, pearly penile papules are the product of your skin. However, there is still no clear answer what it is the real cause of their appearance, so that you can do nothing to stop their appearance. Moreover, it still does not exist a medical treatment which can effectively treat this skin condition.
The laser treatment, the only medical treatment available for this condition is a cheap and risky alternative, as there have been reported many procedures which have ended with side effects, scars and have even affected the normal function of the penis. Thus, the only good way through which you can get rid of the pearly penile papules is to wait for them to disappear by themselves.