Here's MUST know advice about sunscreens, sun sensitivity, and the most common errors in using sunscreens. The first mistake is applying sunscreen incorrectly. Our expert advice is to apply sunscreen 15 to 30 minutes prior to heading out and reapply it every 2 hours. Most people use about half the amount needed for full protection which means you only get half the SPF. Use a teaspoon on each body part or area exposed and use the highest SPF sunscreen you can find. The second mistake is going without additional protection. No sunscreen keeps out 100% of UV rays, so seeking shade is a good move. Also going out before 10:00 AM or after 4:00 PM when the sunrays are not as strong is useful in UV protection. Dressing right is important as well. Clothing made of tightly woven cotton or a polyester-spandex blend provide a ultraviolet protection factor (UPF) above 100. Add a broad-brimmed hat and sunglasses that block 99 to 100% of UV rays. The third most common mistake is not knowing which medications make you sun sensitive. Those drugs include antibiotics, diuretics, pain relievers, antidepressants, and statins. The same holds true for anti-aging products such as retinoids and glycolic and salicylic acids. Have a happy and non-sunburned summer!!