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Why do I get burned even when I use sunscreen?

Do you spread it evenly on every exposed part of your skin and reapply it throughout the day? Exactly. Nobody's that diligent, especially when you're in the middle of something — kayaking, sprinting down a soccer pitch or flirting with that babe.

You need to pile on the skin protection because a white cotton T-shirt only provides an ultraviolet protection factor (UPF) of about seven — and drops by half when it gets wet. A protective lip balm is crucial too. "Protecting your lips is important," says dermatologist Dr Adnan Nasir. "Skin cancer in this location can look just like prolonged chapping."