i don't know what they are, but about two days ago i all of a sudden noticed alot of little white looking bumbs on my arms. there everywhere. almost like a bunch of little white head pimples. microscopic ones. you have to look close, but i've never had this before. i'm scared because i'm 26 and never seen anything like it. though it's small i don't know what it can be or how it came upon. please help.