Burns after shrinking?

It's been two days since I got the Shrink 600 at the Mikum store, and there's a burn-like mark on my neck.

That part keeps hurting. If you look at it in person, it's darker and more noticeable.

I have a wedding photo shoot in two weeks. Will it disappear?

I've done shrinking more than 10 times so far, but this is the first time I've had a scar like this.