What does a scorpion bite look like?
I've never heard of a scorpion actually biting, they tend to use their stinger which would leave a single mark since it's just one stinger.
A scorpion sting is very painful. In some cases the stung area will swell and be very tender when touched. It can resemble a bee sting. Check out http://www.orkin.com/stinging-pests/scorpions/scorpion-bites for more information.