bedbug

Not a bedbug. Many immature bugs will look similar, but bedbugs are truly wingless and won't have the wing pads on the back of the body.

I was sitting outside at a restaurant eating and got bit by this insect. Any thoughts on what it might be?

The bites/stings are the size of a mosquito bite, but have a small blister/pustule at the center.

Based on the size and shape of the body, I would guess it is related to the seed bugs (superfamily Lygaeoidea). Many of them will bite but few result in more than a minor irritation.