This year’s theme is “Scientific Sun Protection, Reasonable Skin Care”. Sun protection is an important part of scientific skin care and an effective way to prevent skin cancer and skin photoaging. Many eczema patients are concerned about whether eczema needs sun protection and whether using sunscreen products will aggravate eczema. Can sunlight aggravate eczema? Some eczema patients find that their eczema gets better after sun exposure or swimming and sunbathing at the beach, and we also use certain wavelengths of UV light to treat stubborn atopic dermatitis/eczema in the clinic. Some studies of atopic eczema patients have found that the prevalence of atopic dermatitis is lower in children with higher UV exposure in the United States; that the prevalence of atopic dermatitis is higher in countries with higher concentrations of ozone in the stratosphere because the ozone layer filters out more of the sun’s UV rays and fewer reach the ground; and that the prevalence of eczema in Spanish children aged 6-7 years is inversely related to the average number of sunny days per year. The prevalence of eczema among children aged 6-7 years in Spain is inversely proportional to the average number of sunny days per year, meaning that areas with a high number of sunny days in a year have fewer children with eczema. However, a recent study found an association between prolonged UV exposure and poorly controlled eczema. In our clinical work, we also find that a small percentage of patients with atopic dermatitis or eczema will have eczema that worsens after sun exposure (called photosensitive atopic eczema). Therefore, on the whole, most eczema patients with appropriate sun exposure is conducive to promoting eczema improvement, individual patients who find that eczema worsens after sun exposure instead (this is usually the case when eczema worsens in light-exposed areas, such as the face, the front of the neck, the lateral area of the upper limbs), then must strictly avoid sunlight. The basic principles of sun protection for eczema patients Eczema patients also need sun protection, the purpose of which is to prevent the occurrence of skin cancer and skin photoaging, the principles of sun protection are the same: 1. Avoidance sun protection: between 10 am and 4 pm, avoid exposure to direct sunlight, and if outdoors, try to move in the shade of trees or buildings. 2.Shade sun protection: wear long-sleeved clothing and pants, use umbrellas, wear sun hats and sunglasses to block the direct sunlight. 3. Use sunscreen products: Choose broad-spectrum sunscreen products with at least SPF 15 and PA+. You need to adjust products with different protection factors indoors, outdoors and in different weather and seasonal conditions. How do I choose a sunscreen for eczema patients? Eczema skin may be sensitive to some ingredients in sunscreen products, so finding an appropriate sunscreen may also be a constant process of trial and error. The general rule is the same as when choosing a moisturizer, try to choose a medical skincare brand that does not contain fragrances or allergenic ingredients. Be careful to check the list of ingredients in sunscreen products. There are some ingredients in sunscreen products that are more likely to cause skin irritation or allergies, so try to avoid sunscreen products with these ingredients added. Benzophenone-3 (Benzophenone-3) is the most common allergic ingredients in sunscreen products, there are also DL-alpha-tocopherol (DL-alpha-tocopherol), fragrance mix (Fragrance mix), methylchloroisothiazolone / methylisothiazolone (Methylchloroisothiazolone). methylisothiazolone), diazolidinyl urea (Diazolidinyl urea), quaternium-15 (Quaternium-15), paraben mix (Paraben mix), phenoxyethanol (phenoxyethanol), formaldehyde (Formaldehyde), etc. Moisturizer + sunscreen, how should I apply it? UV rays from sunlight can damage the skin barrier and cause dry skin, so it is important to moisturize well while protecting yourself from the sun. You can apply moisturizer first, and then apply sunscreen half an hour later, so that you can avoid the moisturizer diluting the concentration of sunscreen products. If you spend a lot of time outdoors in hot and sunny weather, don’t use too greasy moisturizers or apply too thick moisturizers, otherwise you will get an “oily” look and discomfort under strong sunlight. If you can wear a variety of UV protective clothing, etc. for protection, you can reduce the amount of sunscreen appropriately.