Cheers mate! Yeah this is the third time for my scar.
I actually got this touch up done under the guarantee because I didn't want a full session and my crown doing too.
I was quoted 2-3 sessions so my next full session will be paid for and I will do the crown again and the scar if it needs it. But I want to hold it off for as long as possible.
And yes scars are unpredictable with how they react to the ink. Just like they are when it comes to revisions, FUE grafts, lasers, etc.
Unfortunately the only way to find out how they react is to try it.