I woke up yesterday with tiny red itchy dots on my arms and legs. I woke up today and found even more on my legs. Should I be scared?

Bedbugs. It sounds like something is biting you. It could be many different things, but the most likely culprit is bedbugs. Take the sheets off the bed and look in the seams of the mattress and pillows for little black bugs. They are the size of coursely ground pepper. If you find them, put them into a bag and have your primary doctor or dermatologist look at the bug. Bed bugs are easily recognized.