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When you are cold the blood sort of starts to freeze and it stops flowing through your lips so they turn blue
http://wiki.answers.com/Q/Why_your_lips_turn_blue
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If a person drinks things with to much caffeine or if they smoke it may cause your lips to turn black. Although it is just a dark blue some people say they look black. If you have
http://answers.ask.com/Health/Other/what_causes_li...
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The three main reasons for your lips turning black are tea, coffee, and smoking. An average of 2 cups of coffee or tea a day should be fine, but you will need to quit smoking for
http://answers.ask.com/Health/Other/why_are_my_lip...
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Its because of the shock the body is in after receiving the kiss. Because usually the body hasn't gone through with this type of contact that looses cells because when you kiss someone
http://wiki.answers.com/Q/Why_do_lips_turn_blue_af...
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