I was suspicious that it could be Keratosis pilaris also. I have that and I HIGHLY recommend "DERMAdoctor KP duty: dermatologists moisturizing therapy for dry skin." I use it and I love it! You can get it at Sephora make up stores if your area has it.
Have those darkspot on the back of myupper arm and alsoi have some part of my arm that small groupof dot and it is very itchy, What do you think it is??