If it is just a dent from low humidity heavily spraying the snake directly with your mister bottle will make it go away within a few hours, maybe a little longer.

If it is a retained eye cap (it will look less dented and more wrinkled, like a raisin sorta) you just need to keep the humidity at a proper level and when the snake gets ready to shed just make sure to spray the snake down a little extra right before it sheds the skin so it has an easier time getting the extra eye caps off.

A few good soaks cant hurt either...