Sunscreen helps protect our skin against UVA and UVB rays. UVA and UVB are two different types of ultraviolet radiation, it damages the skin ages it prematurely and increases your risk of skin cancer.
Sun damage is one of the largest contributors to aging skin. Did you know that sun exposure accounts to 90% of wrinkles and it actually takes around 20 to 30 years before we see the changes in damage.
UVA means ultraviolet array and it has a very long wave it's considered to be the most damaging to the underlying skin cells, activating the premature aging process. it's the main cause for aging and wrinkling. 90% of wrinkles are usually caused by sun damage, even if it's a cloudy day UVA rays will still penetrate through just about anything even the skin.
UVB which means ultraviolet B ray and it has a shortwave. Although not as potent as UVA ray is known to be, it is the central cause of sun burning and tanning. Excess exposure to both UVA and UVB can lead to skin cancer.
So how can you protect yourself from sun damage easy. Daily use of SPF is the answer. SPF means Sun Protection Factor and it indicates UVB protection. SPF is a gauge of how much time a person can be exposed to the Sun before getting burned.
Besides SPF you also have PA which means UVA protection. PA+ is the least amount of protection you can start off with. PA++ is the medium amount and PA+++ is the most amount. When you're shopping around to find your sunscreen make sure you're reading the product label it has to have both UVA and UVB protection.
The type of sunscreen you should use depends on how fair your skin is. The general rule is : the brighter the skin tone or if you burn more easily, the higher your SPF should be. There are different types of sunscreens you can use, chemical and physical.
Physical sunscreen acts more like a shield deflecting or blocking the sun rays doesn't absorb it like chemical sunscreen. Physical sunscreen can sometimes leave that white cast or white streaking after application and they don't offer as much UVA protection compared to chemical sunscreen. However physical sunscreens are recommended to those with sensitive skin. Chemical sunscreen acts like a sponge absorbing the sun rays. Chemical sunscreens won't leave that white cast and it won't feel as heavy on your faced has the most natural finish and it looks great in photos. However chemical sunscreens can sometimes irritate those with sensitive skin.