What’s this spot on my cat? Razor burn?

I took my cat to the vet a few days ago and they had to shave this site on his neck to do a blood test. It looked like shaved fur (was white short/shaved fur when we left the vet) four days later it looks like the photo attached.

Is this a razor burn? Or is this him licking and scratching at it? Suggestions please re do I take him back to vet and get the cone to stop him licking it.

Although, how would he even be able to lick that? It’s in a funny spot.