If you get itchy bumps on your skin, it’s usually because of bug bites or allergies. But some people get hives spontaneously and aren’t sure what’s causing them. Dr. Tom Miller and Dr. Mark Eliason, a dermatologist, talk about hives and why we get them. Dr. Eliason describes how to treat minor hives at home, when to see doctor about them, and when you should run to the ER because of hives.