1, photosensitive food: Some vegetables and wild vegetables containing high chlorophyll are photosensitive foods, such as celery, spinach, mustard, purple clover, rape, snow lettuce, lettuce, amaranth, capers, cilantro, safflower herb, etc.. After consuming these foods, photosensitive substances enter the skin, making people more sensitive to ultraviolet light, which in turn causes redness and itching of the exposed part of the skin. In addition to vegetables, some seafood and fruits can also increase a person’s sensitivity to ultraviolet light, such as snails, shrimp, crabs, mussels, figs, citrus, lemons, etc. 2, photosensitive drugs: some drugs also contain photosensitive substances, such as tetracyclines, sulfonamides, phenothiazines, estrogens, etc., Chinese medicine in the bone marrow, dahurian dahurica Zhu Huang, thorns, wind, sage also need to be used with caution.