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Friday, April 19

WHY YOU SHOULD USE SUNSCREEN


Hello y'all! Happy Good Friday! So I didn't really know what to post about this weekend, and I was doing my usual review/housekeeping of the website when I noticed this old post and I wanted to re-edit and re-vamp the post so here it is!
It's 2019 and everyone is using sunscreen in their routines regardless of skin type, tone or color. If you are not by now,  you should. If you are not convinced, this post is for you.
If you do use sunscreen and are not sure how to use it or which SPF to use, this post should help explain and clear up some of your confusion.

UV RAYS
Ultraviolet light is light that is invisible to the human eye. This is due to the fact that it has a shorter wavelength than Visible light. Within the UV spectrum, it is subdivided into three bands:
+ UVA (315 – 440 nm) black light. It causes skin damage that leads to tanning as well as premature skin aging and wrinkles.
+ UVB (280 – 315 nm) is the most harmful. It causes sunburn and it plays a key role in the development of skin cancer.
+ UVC (100 – 280 nm) germicidal UV varies in intensity with latitude, elevation and season

UVA and UVB rays both can damage the DNA in your skin cells and lead to skin cancer. Broad spectrum sunscreen or sunscreen with PA ratings target both of these rays.



GENERAL EFFECTS OF UV RAYS
+ Photosensitivity – heightened sensitivity to sunlight
+ Photoallergy – dermatitis (itchy rash)
+ Phototoxicity – severe reaction to sunlight sometimes caused by drugs
+ Photoaging – leathery skin, loss of elasticity, brown spots
+ Premalignant Lesions – changes in the epithelium of the skin and a precursor to skin cancer
+ Malignant Lesions: Squamous cell carcinoma, Basal cell carcinoma, Malignant melanoma



HOW TO PROTECT YOURSELF FROM UV RAYS
+ Stay in the shade
+ Wear a hat
+ Wear sunglasses
+ Use sunscreen with an SPF of 15 or greater 
+ Wear sunscreen even when you are inside
+ Wear sunscreen even when traveling and on the plane

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SPF RATING
SPF or Sun Protecting Factor is calculated by comparing the time to produce a reddening on protected skin to the time needed to cause a reddening on unprotected skin. The SPF in sunscreen is directly related to UVB rays. A fair-skinned person might turn red after 10 minutes in the sun. Ten minutes is their "initial burning time." If they use a sunscreen with SPF 2, it takes 20 minutes before they burn. If they use an SPF 15 sunscreen, it takes 150 minutes, or 2 ½ hours, for their skin to turn red. SPF 15 or higher sunscreens are generally thought to provide useful protection from the sun.
The best sunscreens protect against both UVB (which can cause sunburn) and UVA (which may cause premature skin aging)

The best protection is achieved by applying sunscreen 15 – 30 minutes before exposure, followed by a reapplication 15 – 30 minutes after the sun exposure

Further reapplication is necessary after activities such as swimming, sweating, and running.

PA RATING
While SPF targets UVB rays, UVA rays are targeted by the PA rating system. Which is denoted by (+ ) signs. PA rating measures only PPD (Persistent Pigment Darkening): This is a process on how UVA rays cause the skin to become brown.

+ PA+ = Some UVA protection.
+ PA++ = Moderate UVA protection.
+ PA+++ = High UVA protection.
+ PA++++ = Extremely High UVA protection.

The PA rating also is not related to time as the SPF rating is, so it is hard to determine how long it's protection against UVA rays last depending on skin type.


PROTECTION OF SUNSCREEN DEPENDS ON: 
+ Skin type. I am Medium, but I have sensitive skin, so I go with the sensitive chart. 
+ SPF number
+ Amount, timing and frequency of application. Apply a sunscreen very liberally. To enable full protection, It is best to over apply than not apply enough. The sunscreen should be applied about a half hour before going outside to allow time for the sunscreen to soak in and take effect.
+ Activities while in the sun
+ Amount of sunscreen the skin has absorbed. 



TYPES OF SUNSCREEN
+ Physical sunscreen acts as a physical shield and reflect both UVA and UVB light from the skin. They are not absorbed in the skin and can work immediately they are applied on the skin. They contain ingredients such as titanium dioxide and zinc oxide. They tend to be better for those who have sensitive skin or allergic to chemical sunscreen. Physical sunscreens usually have a white cast, are oiler and are heavier in texture. 

+ Chemical sunscreen absorb UVA or UVB rays in the skin. They work chemically by scattering and deflecting the sun’s harmful rays, and by converting UV rays into heat and deactivating them (Basically a chemical reaction on your skin). They need to be absorbed in the skin and applied 15-30 minutes before exposure. They contain ingredients such as avobenzone, oxybenzone, octinoxate, homosalate, octocrylene, octisalate, and benzophenone. These sunscreens tend to be lighter, and some even have no white cast. However, they can easily irritate sensitive skin.

SUNSCREENS I HAVE USED AND RECOMMEND
+ COMBINATION SKIN, waterproof, perfect for humid weather, working out and running. Banana Boat Sunscreen Sports Family Size Broad Spectrum Sun Care Sunscreen Lotion - SPF 30/50


+ OILY SKIN, Lightweight, No white cast, extremely high UVA protection, hydrating but not greasy. KAO Biore UV Aqua Rich Watery Essence SPF 50+ PA++++


+ DRY SKIN, Physical sunscreen, thick, high UVA protection, moisturizing, no white cast. 3W Clinic Intensive UV Sunblock Cream SPF 50 PA+++



Sources: skincancer.orgMedicine.net, Hawaiiantan.com, Paulaschoice.com, Health.howstuffworks.com, and Dr. Terry Gratton: Introduction to Environmental Health, Radiation. School of Public Health: University of North Texas Health Science Center. No copyright infringement intended.



Thanks for reading!!
Ore :)


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