Embarrassing tan lines?

Get an Ice-pack and and towel. Place the towel under the freezing icepack. Put them on the red tanned bits, with the towel facing down on it. If you can't really feel anything then remove some layers of towel. If it's too intense then put n more. I'm not quite sure if it works, but it's worth a try. It should make the parts a bit whiter (its like how you go really pale in winter).