There are fish-scale lines on the legs, which are called pityriasis in Chinese medicine, and are related to vitamin A deficiency. The appearance of fish scales on legs is related to the excessive keratinization of local skin. Modern medical considerations are related to the lack of vitamin A, which will not lead to skin lesions or other symptoms of general discomfort, mainly affecting the appearance, so it is recommended to protect the affected area. Pay attention to sun protection and cold and heat stimulation on local skin, do not wash it too frequently and gently rub it, do not use too alkaline cleaning solution to avoid local damage, and apply moisturizing cream to moisturize the skin locally. Vitamin supplements should be paid attention to in the diet, and fresh fruits and vegetables should be eaten more, especially carrots, egg yolks, oranges, pork livers and cod liver oil, so as to avoid eating too much seafood, fried and grilled foods. You can also choose to strengthen exercise to enhance your physical fitness and improve your illness.