1. Not applying sunscreen at allWhether your skin is fair, olive or dark you need to wear sunscreen every single day. Your skin can not protect you from sun damage and skin cancer without an SPF.2. Not choosing the right sunscreenThere are two different types of UV rays. UVA rays cause your skin to age more rapidly. UVB rays are responsible for sunburns and the development of skin cancer. Make sure your sunscreen will protect you from both and has an SPF of at least 30.3. You rely on the SPF in your makeupSPF in your makeup is helpful but it does not provide enough coverage to adequately protect you from damaging UVA/UVB rays.4. Not applying enoughThe rule of thumb is that you need enough sunscreen to fill a shot glass for your entire body. Also don’t neglect ears, tops of feet, lips, back of knees and the skin covered by straps.