SPF (Sun Protection Factor) is an index used in sunscreen products to measure its ability to protect against UVB ultraviolet rays, and its value represents the UVB protection multiple provided by the product. For example, a sunscreen with SPF 30 can expose the skin to 30 times the amount of UVB ultraviolet radiation compared to no sunscreen.
To choose the right SPF value, you need to consider many factors, such as your geographical location, time of day, weather, skin type, activity intensity, etc. Generally speaking, the higher the SPF value, the more UVB protection it provides, but it also means that the sunscreen product may be oilier and less absorbable. It is recommended to choose a suitable SPF value according to your skin characteristics and activity environment. It is generally recommended to use sunscreen products with SPF 30 or above, and pay attention to reapplying sunscreen products in indoor and outdoor environments to maintain the protective effect.

Some sunscreen products may irritate the skin, cause skin sensitivity or even allergic reactions. Irritation can be caused by products that contain chemicals that are irritating to the skin, or by using the product incorrectly or choosing a product that is not suitable for your skin.
In order to avoid skin allergies, it is recommended to choose sunscreen products specially designed for sensitive skin or use physical sunscreen products. Avoid using products that contain irritating ingredients such as alcohol and fragrances, and pay attention to whether the products contain substances that you are allergic to certain ingredients. Before using sunscreen products, you can conduct a local test, apply the product on the wrist and other parts, and observe whether there is an allergic reaction within 24 hours. In case of allergies or discomfort, stop using the product immediately and wash the relevant parts.
In addition, when using sunscreen products, you should pay attention to apply them evenly, and do not miss or apply the same part repeatedly. When using cosmetics, sunscreen products should be used before cosmetics to prevent cosmetics from affecting the effect of sunscreen products. Finally, it is recommended to consult a dermatologist or beauty expert before using sunscreen products to choose products that are suitable for your skin.

Some sunscreen products may contain ingredients such as oils and lotions, which may affect the skin's breathability and even clog pores. Especially thick sunscreen lotion is easy to form a thick film on the surface of the skin, which further affects the respiration and metabolism of the skin.
In order to avoid the impact of sunscreen products on skin permeability, it is recommended to choose light and easy-to-absorb sunscreen products, and avoid using too greasy or thick products. In addition, it is recommended to use cleaning products to clean the skin before using sunscreen products, so as to avoid impurities such as dust and dirt from hindering the breathing of the skin. Finally, the skin should be re-washed within an appropriate time after using sunscreen products to keep the skin clean and breathable.

Even if you are indoors, you will be exposed to the sun's ultraviolet rays, so it is recommended to use sunscreen products indoors. In addition, working in front of digital devices such as computers, mobile phones, and TVs for a long time will also be damaged by blue light. Therefore, using sunscreen products indoors can also protect the skin from blue light damage.
The protective effect of sunscreen products is limited and will gradually weaken over time. Therefore, it is recommended to reapply sunscreen products every 2-3 hours, or reapply in time when sweating, swimming, wiping towels, etc. In addition, avoid prolonged exposure to the sun between 12 noon and 4 pm, because the ultraviolet radiation is the strongest during this time, even if you use sunscreen products, you should try to avoid prolonged exposure to the sun.

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Frequent use of sunscreen products will not be a burden to most people, but some people may be allergic to certain ingredients in the product or cause skin irritation, so you should carefully observe your skin condition when using sunscreen products, and immediately Stop using the product.
In addition, some sunscreen products contain chemical ingredients, and long-term use may burden the skin. For example, some studies have shown that chemical ingredients such as oxybenzone in sunscreen products may cause endocrine disruption, cytotoxicity and other problems. Therefore, it is recommended to choose sunscreen products that contain physical sunscreen ingredients (such as zinc oxide, titanium dioxide), or use sunscreen products that contain natural ingredients.
Finally, frequent use of sunscreen products may increase the body's need for vitamin D, because the skin needs sunlight to synthesize vitamin D. Therefore, it is recommended that while protecting the skin, we should also pay attention to maintaining proper sunlight exposure to maintain the body's demand for vitamin D.

People with different skin types need different types of sunscreen. Here are some tips for choosing the right sunscreen for you:
Dry skin: It is recommended to choose sunscreen products with a richer texture, such as cream or moisturizer, to keep the skin hydrated and reduce the dryness of the skin.
Oily skin: It is recommended to choose sunscreen products with a thinner texture, such as gel or lotion, to avoid greasy feeling and reduce the risk of pore clogging.
Sensitive skin: It is recommended to choose non-irritating ingredients and mild sunscreen products, such as physical sunscreen products or sunscreen products suitable for sensitive skin.
Dull skin: It is recommended to choose sunscreen products containing whitening ingredients, such as vitamin C, arbutin, etc., which can effectively prevent the pigmentation of the skin caused by ultraviolet rays.
In addition, when choosing sunscreen products, you should choose products with SPF value and PA value that suit you. The higher the SPF value, the better the sun protection effect, but it does not mean the longer the duration; the PA value reflects the degree of UVA protection of the sunscreen product, and the higher the PA value, the stronger the protection against UVA. Finally, it is recommended to choose sunscreen products with guaranteed quality to avoid damage to the skin by using fake or low-quality products.

After sun exposure, you should use skin care products that can soothe, repair and moisturize the skin. Here are some suggestions:
Soothing Lotion: Soothing Lotion helps soothe sunburned skin, reducing soreness, redness and inflammation of the skin. It is recommended to choose products that contain natural ingredients such as aloe vera, green tea, and aloe vera.
Moisturizer: The skin tends to dry out after sun exposure, so it is recommended to use a moisturizer to keep the skin hydrated and reduce dryness and peeling of the skin. It is recommended to choose products that contain moisturizing ingredients such as hyaluronic acid and glycerin.
Repair Serum: Repair Serum can help repair sun-damaged skin and promote the regeneration and repair of skin cells. It is recommended to choose products that contain repairing ingredients such as vitamin C, peptides, and squalane.
Calming Mask: Calming mask helps soothe the skin, reducing soreness and redness. It is recommended to choose products with soothing ingredients such as aloe vera, calendula, and green tea.
Sunscreen: The skin is prone to secondary sunburn after sun exposure, so it is recommended to use a sunscreen with an appropriate SPF value to protect the skin from sun damage.

If your skin is very dry after sun exposure, you should do the following to moisturize:
Drink plenty of water: The skin is prone to dehydration after sun exposure, so it is recommended to drink plenty of water to keep the skin hydrated.
Use moisturizing products: It is recommended to use skin care products containing moisturizing ingredients after sun exposure, such as moisturizing creams and masks containing hyaluronic acid, glycerin and other ingredients to keep the skin hydrated.
Use aloe vera gel: Aloe vera gel has the effect of moisturizing, soothing and repairing the skin. It is recommended to use aloe vera gel containing high concentration of aloe vera and apply it on the sunburned skin, which can help soothe the sunburned skin and moisturize at the same time.
Avoid products containing alcohol and irritating ingredients: These products tend to make the skin more dry, so it is recommended to avoid products containing irritating ingredients such as alcohol and maltitol.
Improve lifestyle habits: A reasonable diet, moderate exercise, and adequate sleep can also help improve skin hydration.
Finally, it is recommended to avoid bathing or bathing in hot water for 24 hours after sun exposure, as hot water can further deprive the skin of moisture and make it drier. It is recommended to cleanse the skin with warm water and then protect the skin with a moisturizer.

It is a normal reaction for the skin to darken after sun exposure, because ultraviolet rays stimulate the melanocytes in the skin to produce melanin, which in turn darkens the skin. But long-term exposure to the sun will make the melanocytes overactive, produce too much melanin, and form pigmentation phenomena such as freckles and spots.
To restore the skin to its original color, you can start from the following aspects:
Avoid direct sunlight: Avoid prolonged sun exposure during periods of intense sunlight to prevent hyperactive melanin.
Use sunscreen products: Use sunscreen products with appropriate SPF and PA values to protect the skin from ultraviolet rays and reduce the production of melanin.
Use whitening products: Use skin care products containing whitening ingredients, such as vitamin C, arbutin, etc., which can inhibit the production of melanin and reduce pigmentation such as spots and freckles.
Moisturize evenly: Skin tends to dry out after sun exposure, so keeping skin hydrated is also an important step in restoring skin to its original color.
Pay attention to your diet: eating foods rich in vitamin C, E, carotene and other antioxidant ingredients, such as citrus fruits, red and orange vegetables, etc., can help the skin restore health and reduce pigmentation.