There are so many myths surrounding the use of sunscreens. Many of us skip putting sunscreen because we don’t think it really makes a difference. Some also think that since we are dark-skinned we don’t need to use sunscreen. Plus, choosing the right sunscreen can be a hassle because we don’t have clarity about certain terms like SPF, UVA rays etc. Celebrity dermatologist Dr Rashmi Shetty helps clear some doubts about sunscreen. Q. What is SPF? A. SPF refers to sun protection factor. Your sunscreen pack can have SPF 30 or SPF 50. 1 SPF protects you for 10 minutes.