What are the foods that cause photosensitivity?

Foods that have been proven to have clear photosensitivity and are likely to induce photoallergy include furanocoumarin-containing wild vegetables, fruits and vegetables, and some seafood containing photosensitive algae. When I worked as a volunteer assistant in a community dermatology department for the past two years, the most common thing I encountered in the spring were patients who were infected by eating wild vegetables. An aunt dug half a basket of gray vegetables for salad and ate it for dinner. The next day, she went for a walk in the park and sunbathe all morning. When she got home, her cheeks and neck were swollen and hot, and there were dense small blisters. When she came to see the doctor, she could hardly open her eyes. This is typical phytophotolar dermatitis. In addition to gray vegetables, common wild vegetables such as amaranth, shepherd's purse, and vetch, as well as commonly eaten fruits and vegetables such as celery, parsley, figs, and limes, also contain furanocoumarins, but the content is much lower than that of wild vegetables.

Don’t think that only vegetarians are involved in this trap. One time during the seafood season, a young man came and said that he and his friends ate two kilograms of grilled seaweed the night before. After a day of fishing at the beach the next day, purple-red petechiae appeared all over the exposed forearms and back of the neck. They hurt when touched. This is a photosensitivity reaction induced by seafood. For example, snails, oysters, and some deep-sea fish, if they grow in sea areas with a lot of algae, may accumulate photosensitive toxins in the body. If you eat too much at one time and then expose them to the sun, you may easily develop problems.

Nowadays, many people on the Internet say that drinking lemon soaked in water will turn black and eating celery will prevent it from being exposed to light. In fact, they are a bit overly panicked. For ordinary healthy people, soaking one or two slices of lemon at a time or frying a plate of celery will consume a very small dose of furanocoumarins. The threshold for inducing photosensitivity is that unless you nibble on five or six fresh lemons at a time, or eat a pound of celery every meal, and then expose it to the midday sun for two or three hours, you are likely to have a reaction. You don't need to be blacklisted as soon as you hear "photosensitive foods". Of course, if you have a photosensitive constitution, or are taking drugs that are inherently photosensitive, such as isotretinoin or quinolone antibiotics, you should pay more attention. Try to avoid prolonged exposure to the sun after eating such foods. Wear sunscreen and a sun hat when you go out, and you can basically avoid the pitfalls of photoallergy.