SELF magazine's May cover girl Jennifer Garner and Neutrogena have come up with a cool way to help you remind your friends to take care of their skin.

The gist: Remind your friends to get their checkups via e-card and help fight skin cancer at the same time. For every five e-cards you send through SELF's Web site, Neutrogena will make a donation to skin cancer research. And to help you look out for No. 1, you can take the SELF cancer quiz here to see how much you know about cancer (results may be published in a future issue) or download SELF's nifty "spot check" mole map here. Just print it out to keep track of moles and marks you or your doctor find on your skin.