Solar dermatitis is commonly known as sun spots. It is an acute skin inflammation caused by strong sunlight exposure, and is an acute phototoxic reaction that occurs on the skin due to excessive exposure to medium-wave ultraviolet light, mostly seen in late spring and early summer, with women and children prone to the disease. The disease is called sunburn in Chinese medicine, and is thought to be caused by sunlight exposure, the invasion of Yang heat and poisonous evil into the body surface, containing the skin, burning the skin and injuring the muscle; if the poisonous heat is mixed with summer dampness or wrestled with internal dampness, soaking the skin, then swelling, blistering, erosion and oozing after breaking. The clinical manifestations of sunburn are: diffuse erythema starts to appear at the lesion site a few minutes to 2-6 h after sun exposure, peaking at 1-1.5 d and gradually fading after 3-5 d. There is a burning, itching or tingling sensation at the lesion site. In mild cases, the rash can gradually fade in 1 to 2 d, with desquamation or pigmentation of varying degrees; in severe cases, in addition to erythema and swelling, blistering can occur, which forms vesicles after rupture and soon dries, crusts and desquamation, leaving pigmentation or hypopigmentation. The disease usually reaches its peak on the second day after sun exposure and can only recover after 1 week. It may be accompanied by fever, nausea, vomiting, headache, weakness, and even palpitations. In some patients, sunburn symptoms do not occur after sun exposure, but rather skin pigmentation changes in the form of immediate or delayed hyperpigmentation sun spots. Immediate hyperpigmentation is caused by long-wave ultraviolet light and visible light, which can appear after 15-30 min of sun exposure and fade after a few hours; delayed hyperpigmentation is caused by medium-wave ultraviolet light, which often appears 10 h after sun exposure and reaches its peak after 4-10 d, and can last for several months. In addition to hyperpigmentation, sunburn can sometimes provoke lupus erythematosus, vitiligo, capillary dilation and other cosmetic disorders. Some plants contain photosensitive substances, such as spinach, rape, ashwagandha, purple yew, marjoram, capers, amaranth, amaranth, celery, eggplant, potatoes. When eating or contacting these vegetables, the photosensitive substances inside will accumulate in the body and reach a certain concentration, the skin of the exposed parts of the body (face, hands, feet) can lead to metabolic disorders after direct sunlight and induce dermatitis, which is medically known as “vegetable gaze dermatitis”. This kind of dermatitis often occurs in 20-40 years old women, the onset is more urgent, ~ generally in 5-20 h after eating vegetables that meet the face, the back of the hand is diffuse, symmetrical edema, solid texture is not shiny, not red, severe cases can spread to the neck or forearm, lips, eyelids and face swelling purplish red. 1 to 5 d later, edema parts appear bruises or bruises, color from light to dark. This is followed by burning pain, numbness, itching, blood blisters, and symptoms such as headache and sleepiness, nausea and abdominal pain. Once vegetable solar dermatitis occurs, the consumption of vegetables associated with the onset of the disease should be stopped immediately, and sun exposure should be avoided. If the allergic symptoms are severe, antihistamines can be used under the guidance of a physician. The beauty factor The melon and fruit face beauty should be careful of solar dermatitis. As the trend of “back to nature” prevails, melon beauty has become the choice of many women nowadays. However, not all people are suitable for this beauty method. The fruit of the melon compress has a certain whitening and rejuvenating effect, but the concentration of fruit acid is super high, with strong corrosive, improper application is a great harm to the skin. For people with sensitive bodies, melon and fruit compresses may cause skin allergies. For example, the aloe glycosides in fresh aloe vera and mango glycosides in fresh mangoes are good at absorbing the medium and long wave ultraviolet rays in the light, and these substances are converted into another highly allergenic substance after absorbing the light, causing local redness and blistering. People with a sensitive body are prone to allergies. Melons and fruits that can cause gaze dermatitis include cucumbers, tomatoes, red grapes, figs, radishes, potatoes, etc. So fresh melon fruit juice for sensitive body people can not be randomly applied to the face, for people prone to hives, skin eczema or bronchial asthma and other allergic diseases, with fresh fruit compresses beauty should be more cautious. Physical factors The white and dry skin is more sensitive to sunlight. People with fair and dry skin are generally more sensitive to sunlight than people with oily skin and dark skin. In addition, certain diseases can be triggered or changed by sunlight, the most obvious one being lupus erythematosus. 30% of lupus erythematosus patients are sensitive to sunlight, so these patients should avoid sunlight as much as possible, use sunscreen, hold an umbrella or wear a wide-brimmed hat, wear light-colored long-sleeved tops and long pants. Avoid taking photosensitive drugs. The most important thing is to avoid going out. When you have to go out, you should wear long-sleeved clothes and pants (light colors are better). Wear a straw hat or umbrella to get a good effect. Strengthen the skin nutrition, usually eat more fresh fruits and vegetables, moderate amount of fat, in order to ensure that the skin’s sufficient elasticity, enhance the skin’s anti-wrinkle vitality. Vitamin C and vitamin B12 can stop and weaken the body’s sensitivity to ultraviolet light, and can promote the fading of melanin and restore the elasticity of the skin, so you should eat more foods rich in multivitamins in summer. Avoid eating photosensitive foods to avoid the recurrence of old diseases. Patients can summarize themselves to see if the occurrence of dermatitis is related to the food, cosmetics, drugs, etc. that they come into contact with, and if they find a connection among them, it is best to avoid contact. They can also go to a hospital dermatology department and ask the doctor to help find the allergenic substances through patch test and light spot test. Enhancing the skin’s tolerance to sunlight is an important measure to protect skin health. Choosing early morning and late evening, when the sun is not too strong, for proper and moderate sun exposure can enhance the skin’s ability to adapt and keep the skin from excessive sunburn and tanning in summer. Appropriate skin massage can promote the metabolic function of skin tissues, enhance the skin’s resistance to melanin deposition and make the skin full of youthful vitality. In order to effectively prevent sunburn, it is best to apply sunscreen externally. It is advisable to wear red clothing when you go out to prevent the harmful effects of UV rays. Because ultraviolet light is located in the bottom of the sun’s “seven-color spectrum”, the shortest wavelength, the farthest away from infrared light, so it is easy to be accepted and absorbed by the longest wavelength of red. Sunlight dermatitis self-treatment: after the occurrence of gaze dermatitis, the light can take the following methods to deal with themselves: only erythema without blisters, or small blisters not broken, available ice milk solution (milk and water l0:1) or physiological saline (1 teaspoon of salt dissolved in 500 ~ 600 mL of water) wet compress, each time 15 ~ 20 minutes, 2-3 times a day. Also take vitamin C and vitamin B complex with it. If solar dermatitis is more serious, especially if it is accompanied by nausea, vomiting, palpitations and other systemic symptoms, do not take care of it without authorization. Patients with induced hyperpigmentation and vitiligo must also seek medical attention.