Finally, Dr. Johnson reminds, it's important to know your SPF.

"SPF factor means 'sun protection factor.' If you were going to burn in one minute and you put an SPF 30 on, that means it would take you 30 minutes to get the same amount of damage.

The Skin Cancer Foundation recommends SPF 15 for daily use and SPF 30 for outside activities or prolonged exposure. An SPF of 30 does not protect you twice as long as an SPF 15. SPF 15 filters approximately 93% of UVB rays, SPF of 30 filters approx 97% of UVB rays.

Choose an SPF of 30 on a daily basis. If you are heading out to the beach or park, go a bit higher like SPF 55 or 60."