You know the drill: Never leave the house without sunblock. But how often do you stop to slather before you walk out the door? If the answer is never, get this: Men are two to three times more likely to get non-melanoma basal cell and squamous cell skin cancers than women. Melanoma—the most dangerous form of skin cancer which accounts for 48,000 deaths per year, worldwide—is now on the rise in people ages 20 to 40. Which is why both the American Cancer Society and the American Academy of Dermatology recommend regular skin self-exams to check for any changes in marks on your skin including shape, color, and size. Download this app: SpotCheck (free on iTunes). It lets you upload photos of your most worrisome moles for a team of board-certified dermatologists to review. You'll hear back within 24 hours whether you need to schedule an appointment with a derm near you to discuss any suspicious-looking moles.