As long as I've known my best friend, she's been complaining about these tiny red bumps on the backs of her arms. She thought they were some kind of acne, like what you get on your back when you workout, so she went to her dermatologist to find out.
It turns out that it was a common condition called keratosis pilaris - a complicated name meaning bumpy skin. Actually 50% of people have it, so if you don't have it yourself, you probably know someone who does.
