What are common sunscreen application mistakes?
The most common mistake is applying too little. Most people use about a quarter of the recommended amount, which can reduce the actual SPF received by more than half. Other common mistakes include skipping the neck and ears, not reapplying when spending time outdoors, and applying sunscreen too close to going out for it to settle properly.
SPF testing is done with 2 mg of product per square centimeter of skin. In practice, most people apply between 0.5 and 1 mg per square centimeter, significantly reducing effective protection. The 3-finger rule is a helpful guide for the face. Other overlooked areas include the back of the hands, the hairline, the lips, and the eyelids. Applying sunscreen in a well-lit space where you can see your face clearly helps ensure even coverage. Reapplication every two hours is important when outdoors, as sunscreen degrades with UV exposure, sweat, and rubbing.