She is a redhead, and has lightly freckle arms, and a very white back and décolleté. When she was very little, she got quite badly sunburned while wearing a short sleeved t shirt, and her arms from the edge of the sleeves down (if you see what I mean) are slightly darker than from there up. Once again, IYSWIM! It really isn't a huge problem, but she is a bit conscious of it, and usually wears clothes that cover it.
She has a most wonderful black dress for her 6th form ball with spaghetti straps. It looks amazing against her white skin- but she is very conscious of the "line" on her upper arms. Is there anything she could do? Is there such a thing as an incredibly pale spray tan that would even things up? Or any other ideas?