3. The backs of your knees
Sunburn in this area can be incredibly dangerous. “The most common place for melanoma on a woman is the back of the legs,” Dr. Carroll says. Be sure to slather a generous amount on the entire leg, front and back. To avoid confusion about how much sunscreen to apply to your body, Dr. Carroll says to visualize a shot glass or a golf ball–this amount should be sufficient to cover your entire body.