Human skin is thin and itchy, which may be caused by lack of water, dry skin and malnutrition. It is suggested that you increase water intake and apply appropriate moisturizing cream to relieve dry and itchy skin. In addition, a balanced diet and nutrient intake are also important. You can eat some foods rich in vitamins A, D, E and Omega-3 fatty acids, such as fish, nuts and olive oil. If itching persists or symptoms worsen, please consult a doctor for further examination and treatment.