Here is a photo of a tick bite from a blacklegged tick or also known as a deer tick.

That is the tick that causes Lyme disease. FYI, Lyme disease is an infection spread through the bite of a deer tick that is infected with a bacterium called Borellelia burgdoferi (who really cares about the name!). Those cruddy ticks get it from biting another infected animal like a deer, bear, mouse, other mammals, and even a bird. (So how did those critters get it?)