Do you think they can be related to your hair follicles? Keratosis Pilaris is something that makes little bumps on skin and is common especially on arms. Some people call it chicken skin which is so charming. I've had this. It's very very common! It's basically excess skin cells building up around hair follicles and its hereditary. For me, what worked was a balm on the skin (aveeno eczema balm -- although I don't have eczema OR aquaphor). There is a scrub I get at the grocery store too that helps. There are other treatments such as vitamin A creams, urea, etc.
Not sure if that is what is going on but would venture a guess that this is what it sounds like.