Bad skin may be a lack of vitamin A, vitamin B, vitamin C, vitamin E, etc. It is recommended that patients seek medical attention to clarify the cause of the disease and then take targeted vitamin supplements under the guidance of the doctor. If itchy or rough skin occurs, it may be a lack of vitamin B, which can be relieved by moderate supplementation of vitamin B to alleviate the symptoms. The lack of vitamin C and vitamin A may lead to endocrine disruption, which will cause the skin to age faster, and it is likely to have dry skin, which can be relieved by supplementing vitamin C and vitamin A. Vitamin E can maintain skin elasticity, antioxidant erosion and prevent premature aging of skin cells. It is recommended to drink more water, eat more fruits and maintain a regular life. Bad skin may also be caused by diseases, it is recommended to consult a doctor in time to clarify the cause of the disease and treat under the guidance of a professional physician.