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오 그렇군요~ 좋은 정보 알아갑니다
The Sun Protection Factor (SPF) indicated on sunscreen refers to the effectiveness of blocking ultraviolet B rays.
The number after SPF means not applying sunscreen
It refers to the ratio of the amount of ultraviolet radiation that causes erythema when exposed to sunlight.
However, since the SPF rating is merely an indicator of protection against erythema and does not reflect the degree of pigmentation,
To prevent skin from turning dark due to UV rays
You must check the UV-A protection rating (PA) when choosing a sunscreen.
Generally, I recommend sunscreen with SPF 30 or higher and PA+++.