'Many people are making a serious mistake when painting sunscreens,' scientists ring the alarm bell

by Lola & Lucy's Mom

People who paint sunscreen on the exposed parts of the skin to prevent ultraviolet rays will become more popular when they become outdoor leisure such as the sea and the pool when becoming full of summer. However, scientists insisted, "Many people are not painting sunscreens correctly," he is ringing a warning bell.

Acta Dermato-Venereologica - Sub-optimal Application of a High SPF Sunscreen Prevents Epidermal DNA Damage in Vivo
http://www.medicaljournals.se/acta/content/abstract/10.2340/00015555-2992

Most of Us Are Making a Crucial Mistake When Applying Sunscreen, Scientists Warn
https://www.sciencealert.com/most-of-us-are-applying-sunscreen-wrong-skin-cancer-risk

The sun block prevents sunburn and skin aging by blocking ultraviolet rays hitting the skin. When sunscreen was developed for the first time in the mid-19th century, the value of SPF which indicates the UV protection performance of the sunscreen was only " SPF 2". The subsequent research has greatly improved the performance of sunscreen, and sunscreens with SPF 30 to 50 or more are also on the market in recent years.

Various types of sunscreen such as waterproof type, spray type, gel type etc are developed, and people apply sunscreen evenly to all parts exposing the skin. However, a research result was announced that "Many people have wrong sunscreen and incomplete UV protection effect."

According to past studies, it is said that average people apply 0.75 mg sunscreen per square cm on average. However, researchers at Kings College London explained that with a sunscreen usage of 0.75 mg per square centimeter, even with a 20 SPF sunscreen, it is practically effective only on the order of 4 FPS. In order to obtain the effect as written in the package, it is necessary to paint sunscreen about 2 mg / cm 2, so most people paint less than half of the necessary sunscreen usage .

by Mario Antonio Pena Zapatería

The effect of sunscreen depends on the value of SPF and the amount of sunscreen applied. The research team divided 16 subjects into 2 groups of 8 people, 3 females and 5 men, and they were exposed to ultraviolet rays under different conditions, respectively. In the first group of groups, sunscreens were applied to various parts of the body at various thicknesses, and the same amount of ultraviolet radiation was applied to each part. The group of the second group seemed to have applied sunscreen at various thickness for 5 days and exposed different ultraviolet rays every day.

As a result, it was found that in the second group of groups, the damage of ultraviolet rays was considerably large in the sunscreen area that was thinner than the appropriate amount. On the other hand, it was found that when the sunscreen of an appropriate thickness is applied, even if the amount of ultraviolet rays greatly increases, the damage by ultraviolet rays is considerably reduced.

According to the research team, it is better to apply a high level of ultraviolet radiation by applying an appropriate amount of sunscreen, rather than applying a small amount of sunscreen and exposure to low level ultraviolet radiation, resulting in less damage by ultraviolet radiation It is said that it will be.

by Fort George G. Meade Public Affairs Office

From the viewpoint of protecting the skin from the risk of skin cancer etc., it is said that there is no big difference whether it is SPF 50 sunscreen or SPF 100 sunscreen. However, that is the case when painting an appropriate amount of sunscreen. It is best to use a sunscreen with a high SPF value as much as possible if you feel that using a proper amount of sunscreen "If you use too much with a single dose and do not waste it" It is done.