I have these sort of little pimple things on my arms, what is it? SHould I be worried?

They are not really big and there is not a lot of them.I have these sort of little pimple things on my arms, what is it? SHould I be worried?
look up keratosis pilaris for more info.so common,one in every 2 human beings have it!then go to the drugstore and ask for ';k.P duty'; cream,or any other remedy the pharmacist carries/reccomends for this problem.exfoliate area in shower gently with loofah sponge.do not wear tight restrictive sleeves.it is a buildup of dead skin cells in the pores,thats all.gets worse in winter due to tight sleeves/sweating.usually,u notice u have it when warm weather comes,u put on ur summer clothes and notice ur all bumpy.i had it,with cream and exfoliation,im fine.all ages and races can get this.its annoying but harmless.