Photosensitive foods are those that are likely to cause solar dermatitis. Generally speaking, photosensitive foods are digested and absorbed, and the photosensitive substances contained in them will enter the skin, which will react with sunlight if exposed to bright light. If exposed to bright light at this time, it will react with the sunlight. This will lead to redness, swelling and rash of the exposed skin, accompanied by obvious itching, burning or stinging sensation. Some vegetables with high chlorophyll content and wild vegetables (ashwagandha, bitter greens) are photosensitive foods. Common photosensitive foods are ashwagandha, purple clover, snow lettuce, lettuce, fennel, amaranth, capers, celery, turnip leaves photosensitive foods photosensitive foods, spinach, raising wheat, cilantro, safflower herb, rape, mustard, figs, citrus, lemon, mango, pineapple, etc. In addition, “photosensitive seafood” including snails, shrimp, crabs, mussels, etc., also contains photosensitive substances, also need to pay attention to. Exogenous photosensitive substances include skin daily contact such as beauty cosmetics, cleaning agents in fragrances, preservatives, aniline and aniline derivatives, dyes, etc.; occupational exposure or external use on the skin such as tar, asphalt and some moss-like plants, dahurica, dahurica, coumarins, etc. Endogenous drugs such as tetracycline family, ashwagandha, sulfonamides, nalidixic acid, fenagan, ketorolac, chlorpromazine and other phenothiazines, estrogens, etc. Endogenous photosensitive substances such as porphyrins cause photosensitivity reactions, mainly seen in porphyrias. Examples Among vegetables, the most typical photosensitive food is ashwagandha, but it is now relatively rare. Celery, lettuce, rape, spinach, chard, purple clover, mustard, marjoram, figs, etc., also contain photosensitizing substances, but unlike ashwagandha, whether these foods can cause solar dermatitis depends more on the individual’s constitution, so those with allergies should try to eat them carefully. In addition, certain Chinese herbs, such as bone marrow and angelica dahurica, also contain photosensitizing substances and need to be taken into account. Photosensitive foods: mud snail, ashwagandha, purple clover, snow lettuce, fennel, amaranth, capers, celery, radish leaves, spinach, buckwheat, parsley, safflower, rape, mustard, figs, citrus, lemon, mango, pineapple, etc. Photosensitive herbal medicines: dahurica dahurica, geranium dahurica, thorny mustard, bupleurum, salvia, etc. Photosensitizing Western medicines: sulfonamides, aspirin, sodium salicylate, tetracycline, paracetamol, Librium, oral contraceptives, estrogen, etc. Fragrances in cosmetics: bergamot oil, lemon oil, sandalwood oil, musk, ambergris, etc.; sunscreen in the shading agent. In addition, often take oral vitamin B, especially niacinamide, to reduce the sensitivity of the skin to sunlight. PS: Treatment considerations for allergies First, the most effective treatment is to stay away from allergens. Second, use antihistamines. Patients with asthma, glaucoma, kidney and liver disease should be very careful before taking any antihistamines. For example, the use of Xithromax is not currently recommended because of its side effects. (Allergies are caused by a dysregulation of the immune system. This dysregulation, which occurs at a certain point in life, does not mean that the person is doomed to a lifetime of suffering. Prevention of allergies is more important than treatment. It should start with a careful lifestyle, proper diet and appropriate physical exercise. First of all, in early spring, the temperature is still cold, and under the stimulation of cold air, the thyroid gland is hyperactive and consumes calories, which makes the body’s endurance and resistance weakened. Therefore, the diet is still based on high calories, in addition to eating more bean products, but also glutinous rice products, soybeans, sesame flour, peanuts, walnuts and other foods, but also to increase the supplementation of high-quality protein, such as eggs, shrimp, fish, beef and other foods, these foods are rich in amino acids, with the effect of increasing the body’s ability to withstand cold. In addition, to take enough multivitamins and minerals, such as vitamin D has antiviral ability, rich in vitamin D foods such as cabbage, tomato vegetables and citrus, lemon and other fruits; vitamin A can protect and enhance the function of the mucous membrane of the upper respiratory tract and respiratory epithelial cells, so as to resist the attack of various disease-causing factors. Foods rich in vitamin A include carrots, etc. Vitamin E has the function of improving the immunity of the body and enhancing the ability to resist diseases. Foods rich in vitamin E include cabbage, cauliflower and sesame. In addition, black fungus and mushrooms are also indispensable foods. Then there is the need to have proper outdoor activities to improve the body’s ability to fight diseases, which is beneficial to the prevention of spring allergies. Patients who intend to undergo Ira photodynamic and NB-UVB are advised to avoid using or consuming photosensitive foods and medications for three days before and after the related treatments.