I Scream, You Scream, We All Scream for... Sunscreen?

Behind every fond memory of fun at the beach, there is a parent slathering sunscreen on you. Sunscreen is a topical lotion that absorbs or reflects ultraviolet (UV) radiation. UV radiation in large amounts can damage the DNA in our skin cells by causing a reaction between two molecules of thymine [1]. There are two main types of UV rays:

1. UVB, that causes sunburns.

2. UVA penetrates the skin. 

Both of these can cause skin cancer. Getting sunburned is an unpleasant experience, but more importantly, getting sunburned just once every two years can triple your risk of melanoma skin cancer [2].

Have you ever wondered why applying sunscreen makes you look like a ghost? It’s all about the ingredients.

There are two types of sunscreen ingredients:

Physical filters, like titanium dioxide and zinc oxide, that reflect UV light. Fun fact: Since titanium dioxide and zinc oxide are white in colour, they leave a “white cast” on the skin [4].

Chemical ingredients such as avobenzone and oxybenzone absorb

UV light, and doesn’t leave white streaks.

While it may look odd that you’re a few shades lighter after sunscreen, white cast isn’t harmful. Opting for tinted sunscreens or gel sunscreens can make you less conscious about it.

Your sunscreen should be broad-spectrum, blocking out both UVA and UVB rays, with an SPF of 30 or above. Dr Anna Lien-Lun Chien, M.D. suggests applying sunscreen 15 minutes before going outside and reapplying every two hours [6]. Next time you’re packing for a fun day outside, don’t forget your sunscreen!