Rey loves Ben's scars. The way they paint his skin provide stories, and she loves to hear every one of them. Every account of narrow escapes from death, or just silly mistakes when training. Even the ones that he doesn't share the background for she believes to be beautiful. They are beautiful because even though he doesn't tell her, Rey knows they are from the childhood he tried to destroy yet failed to do so.
And when she wakes to the sound of Ben's whimpers and choked sobs from beside her, Rey rolls over and faces his trembling form. She caresses the scar on his face, the one she put there, and watches Ben's eyes flutter from beneath his closed lids. A sigh escapes him and he slowly relaxes, drifting back to a peaceful slumber.
She knows the emotional scars left behind by Snoke will never fade away as will his physical ones. They are just as much a part of Ben as the Force that thrives within him, and she is fine with that.
Because no matter how many scars he has, no matter what form they take, Rey knows that she will love him all the same.