Comment by JohnBooty

From the article:

    Stranger still, melanoma most commonly 
    affects the hip, thighs and trunk, which 
    are areas of the body protected from the 
    sun.

Could increased sun exposure to one's left arm result in an increase in other parts of your left side besides the arm?

Also, given the colder climate, how many Swedish drivers drive with their bare arms hanging out of the window?