V.B.
Sounds like it is KP instead of acne. keratosis pilaris
http://www.mayoclinic.com/health/keratosis-pilaris/DS00769
I got mine to go away years ago using Selsun Blue on my upper arms. My son had it really bad on his elbows about 2 years ago. He started using the Selsun Blue on them and it is almost completely gone. (his looked almost like raised scars it was so bad, b/c it itched and he would scratch it).
If it is KP, it is harmless, but annoying and embarrassing (otherwise why would you be posting about it, right?). But it can be treated. It is keratin clogged around the hair follicles, essentially.