What does SPF numbers means AND neutrogena dry touch SPF50+ review

Sunscreen is extremely important especially if you are acne prone or just recover from having acne. Sunscreen not only helps to protect your skin, it also helps to prevent your skin from getting permanent scars. Know your SPF and please re- apply if you know you will be out in the sun for long. My opinion on neutrogena ultra sheer dry-touch sunscreen lotion SPF 50+ for face and body.