1. Women, children and people with light skin are prone to get sick. Generally, diffuse erythema appears in the exposed area about 6 hours after sun exposure, which is bright red with clear boundary, and reaches the peak in 12 ~ 24 hours, and then the erythema subsides, leaving pigmentation.

Second, the skin is red and hot, with burning and tingling. When you come back from traveling or working outdoors, you will feel red and hot, irritable, irritable and uncomfortable, which means you have a sunburn.

Third, there are obvious erythema and bright red in the exposed parts, and blisters and erosion may occur in severe cases; Subsequently, the erythema darkens and falls off, leaving pigmentation or decline. Conscious burning or tingling often affects sleep. It takes 2 ~ 3 days to recover, and it takes about a week to recover. Individual patients may be accompanied by conjunctival congestion and eyelid edema. People exposed to a wide range of sunlight may cause systemic symptoms, such as fever, chills, headache, fatigue, nausea and general malaise, and even palpitations, delirium or shock.

Fourth, sunburned skin will generally start to harden and thicken the next day, and even make the skin's transparency disappear. If you don't pay attention, it will eventually lead to uneven skin color and sunburn.

5. The main manifestation of first-degree sunburn is that after exposure to strong ultraviolet rays for several hours, the exposed skin parts are red and slightly swollen, and diffuse erythema appears after local skin exposure, with unclear boundaries. When it reaches its peak after 24-36 hours, sunburned skin will feel tight, burning and itchy.

Sixth and second degree sunburn is mainly manifested as local skin redness and swelling, and then blisters appear. The blister wall is very tense, and the color of blister fluid is light yellow. I feel that my skin will feel burning or itchy, and my skin will feel intense pain after rubbing clothes. It's unbearable Once the blister is worn by friction, it will become a rotten surface. After a long time, it will dry and scab, leaving pigmentation on it.

Seven, the most serious sunburn is the third degree sunburn. The main manifestations are individual necrotic keratinocytes to large area fusion necrosis, superficial dermal blood vessels will expand, and a small amount of lymphocytes will infiltrate around the blood vessels. Many people become very uncomfortable after third-degree sunburn, and have symptoms of chills, fever, nausea and vomiting. Mild people can get rid of these uncomfortable symptoms within 1-2 days, and severe people need a week to return to normal, and finally peeling and dark skin color appear.