It should be spread thinly in overlapping layers, about the size of a 500 won coin.
Sunscreen needs to be applied more generously than you might think. The recommended single-use amount of sunscreen for adults is 0.8 to 1.2 grams. In terms of shape, this is roughly the size of a finger segment or about the size of a 500-won coin. According to data published in the Journal of the American Academy of Dermatology, most people use only about a quarter of the recommended amount of sunscreen. As a result, the UV protection effect is also reduced to a quarter. Therefore, it is important to follow the recommended amount and apply enough sunscreen. The method of applying sunscreen is also important. A small amount should be dabbed onto the fingers and then gently patted onto the face, spreading the sunscreen thinly. Do not apply all the sunscreen at once; instead, spread it in thin layers.
Apply even in blind spots with little sebum secretion
Sunscreen is usually applied mainly to the face, focusing on broad areas such as the cheeks and jawline. While this might seem sufficient for UV protection, the edges of the face, such as the jawline and sideburns, become blind spots. The jawline and sideburn areas have less sebum, so if sunscreen is not applied properly, the skin can be damaged, leading to the dilation of capillaries in a spider web pattern or pigmentation issues like dark spots and blemishes. It is important to apply sunscreen well on areas with low sebum production, such as the ears, earlobes, sideburns, jawline, and neck, especially during summer skin care. Additionally, to maintain continuous UV protection, it is recommended to reapply sunscreen periodically even outdoors. Dermatologists suggest that reapplying a moderate amount of sunscreen frequently is better than applying a large amount once with a high SPF.
Even if you only apply sunscreen, you still need to cleanse thoroughly.
Even if you only applied sunscreen without makeup, thorough cleansing is necessary due to the large amount of chemical ingredients in sunscreen. If not properly cleansed, the sunscreen can irritate pores activated by direct sunlight, leading to 'maloca acne.' This acne appears as hard inflammatory nodules on sun-exposed areas such as the face, back, and arms, and can persist for several months. In particular, waterproof sunscreens that do not easily wash off with sweat or water require even more meticulous cleansing.
Sensitive and problematic skin should avoid organic UV filters
Sunscreens are divided into organic filters, inorganic filters, and mixed filters based on their UV protection methods. Organic filters chemically block ultraviolet rays by applying ingredients such as ethylhexyl methoxycinnamate, avobenzone, and oxybenzone to the skin. These ingredients absorb UV rays into the skin and then release heat, providing a blocking effect. They do not cause whitening or whitening phenomena and have good spreadability. However, organic filters contain a large amount of chemical ingredients, which can cause skin troubles and eye irritation. Therefore, it is advisable for sensitive or troubled skin to avoid using organic filters.
Physical UV filters are mineral sunscreens that contain inorganic compounds such as zinc oxide or titanium dioxide. They form a barrier on the face that reflects or scatters ultraviolet rays. Compared to chemical sunscreens, they cause less skin irritation and less eye stinging, making them suitable for sensitive skin. However, they tend to have poor spreadability and can cause a white cast.
Meanwhile, mixed sunscreens are a combination of organic and inorganic sunscreens, offering minimal skin irritation and good spreadability. However, among mixed sunscreens, some products have higher proportions of inorganic or organic ingredients, so it is advisable to check the ingredients before purchasing.
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