That puckered scar is from a boil that got out of hand. The main part of it is about an inch wide, with scarring going out another half inch surrounding.
I actually did almost die from this because the staph infection got into my bloodstream. Nasty shit.
Well, if I carry inside the waistband, the holster puts a lot of pressure on this spot. Short little guns, like my J-Frame, end right about on top of the scar and really dig in.
It's still tender, three years later.