With the advent of summer, sun-related diseases are becoming more and more common. Patients suffering from such diseases need to avoid some photosensitive foods and drugs in addition to taking medication as prescribed by their doctors. 1, common photosensitive food: mostly some heavily scented vegetables, such as celery, coriander, fennel, parsley, etc.. In addition, lemons, figs, mangoes, pineapples and other fruits also contain some substances that can easily lead to photosensitivity. 2, drugs: common drugs in dermatology, psoralen, retinoic acid (Avion A, retinoic acid cream, adapalene, etc.), etc. can easily lead to photosensitivity, and some tetracycline antibiotics, quinolone antibiotics, sulfonamide antibiotics, etc. also have similar effects. Patients with sun allergy should avoid eating or taking these foods and medications. If they cannot avoid them, they can choose to eat them at night or avoid exposure to sunlight during consumption (e.g. go out when the sun is weak, wear long sleeves and long pants, bring sun hats, sunglasses and umbrellas, etc.). If the rash worsens due to sun exposure, you should follow up promptly to avoid delaying the disease.