Using a cosmetic that has SPF is sufficient protection.
Any exposed part of your body can get skin cancer. That includes your scalp, lips, hands, and feet. Yes, a cosmetic with SPF can help to protect your face, but you also need UVA/UVB protection which is typically only found in cosmetics that include a specific barrier ingredient. You would still need to re-apply that cosmetic completely over your face with a certain frequency to maintain the effective sun protection barrier. A better recommendation is to use a sun block and re-apply it per the directions. Adding the use of a mineral face powder with sun block can be a great way to reduce shine and maintain face skin protection during the daylight hours, in addition to head to toe use of a skin block.