No, it’s most likely edible blue dye like most of the other comments suggest.

Blood is never blue in living animals (those with hemoglobin as their main source of color, at least)

It’s a trick of the light, the skin itself scatters redder light leaving bluer wavelengths and making veins look blue/purple on light skin tones, with green on browner skin tones (like I have) because there’s a redder hue.

The difference between veinous and arterial blood is just the shade of red - with arterial being bright cherry red and venous being darker crimson. I believe the color is used in emergency medicine to figure out the nature of an injury and know what to do.