For now, it is close enough to have an atmosphere. It is summer. Another hundred years, come winter, it will be so cold the atmosphere will freeze solid and literally fall to the ground. Gravity takes care of everything.
Madness string 692
But people don't get large facial scars in a vaccuum. It's very likely that something awful and traumatic happened to them which caused the scar. The events leading up to my scarring were over fifteen years ago and I can still confidently say its the worst thing that's happened to me in my life.