It is well known that sun exposure can replenish calcium. When the ultraviolet rays in the sun irradiate the human body, it can promote the body to synthesize vitamin D to prevent rickets. Ultraviolet rays also have a bactericidal effect, and ultraviolet rays are used to disinfect wards in hospitals. However, excessive ultraviolet rays can harm the human body, so you need to pay attention to protection. In the hot summer, when faced with the scorching sunshine, ultraviolet rays are particularly strong. Doctors advise that you should stay out of the sun as little as possible and use sun protection at this time, so that your skin can survive the summer safely.
Ultraviolet rays in sunlight are divided into three bands. Among them, long-wave ultraviolet rays (UVA) and medium-wave ultraviolet rays (UVB) can penetrate the atmosphere and reach the dermis and basal layer of the epidermis respectively. What we usually call sun protection , It protects against both UVA and UVB rays. Long-term UV exposure can cause a variety of skin problems, and it can be said to be the biggest culprit causing skin wrinkles, aging, sagging and dark spots. Severe cases may even cause cancer, such as actinic keratosis, basal cell carcinoma, squamous cell carcinoma, and malignant melanoma.
Gong Yu, deputy chief physician of the Dermatology Department of the Tenth People's Hospital, reminded that in the scorching summer, sun protection is the focus of skin care in the season. Citizens can adopt some practical sun protection techniques to avoid UV damage. The most important thing about sun protection is to try not to be exposed to the sun or to be exposed to the sun as little as possible. Ultraviolet rays are strongest between 11 and 14 o'clock in summer, so you should try to avoid going out during this time. Especially for young children, their skin is delicate and they are not suitable for activities under strong sunlight. In addition to avoiding periods of strong ultraviolet rays, outdoor activities can also be judged based on the length of the shadow when the child stands in the sun. When the shadow length is shorter than the height, , it is recommended not to engage in outdoor activities.
If it is unavoidable to go out, it is recommended to give priority to hard-core sun protection methods, such as holding a parasol, wearing a sun protection hat, and wearing sun protection clothing . Fabric products can directly block sunlight. The higher the yarn density, the darker the color, or the sunscreen coating, the stronger the UV absorption capacity and the better the sunscreen effect. When choosing sun protection products, you can remember a few numbers: that is, you should choose a sun protection hat with a brim >7.5 cm in length, which has a better sun protection effect; be sure to choose parasols and sun protection clothing produced by regular manufacturers. It is recommended Choose products with ultraviolet protection factor (UPF)＞25 and UVA transmittance ＜5%.
Sunscreen skin care products should be applied 15 minutes before going out, and general products need to be reapplied every 2 to 3 hours.
Special attention should be paid to the following: Babies younger than 6 months have delicate skin and it is not recommended to use sunscreen skin care products. Sunscreen should be protected by avoiding sunlight and covering with clothing. For infants and young children aged 6 months to 2 years old, it is still recommended to choose sun protection methods mainly covered by clothing. They can also choose physical sun protection products within SPF10/PA+, preferably cream or powder products.
reminds everyone that there are some photosensitive foods that can easily cause solar dermatitis, such as fennel , amaranth , celery, gray cabbage , fig , mango, pineapple, papaya, etc. If you need to stay in the sun for a long time During activities, care should be taken to avoid consumption.
information: Shanghai Tenth People's Hospital
