Stainless steel is beautiful, light and durable, corrosion-resistant and rust-free, and is very popular among people. Stainless steel is made of iron-chromium alloy infiltrated with trace metal elements such as nickel, molybdenum, titanium, cadmium and manganese. These trace metal elements are harmful to human body, as long as they do not touch some substances with strong electrolyte, such as soda water, acid and alkali. These are rarely touched. Remember to take them off when taking a bath. Stainless steel itself has a protective oxide film on its surface. If it comes into contact with strong electrolyte, rinse it with clear water. Don't forget to clean your ornaments when you wash your face. Keep it clean and you'll be fine. As for the skin allergy mentioned upstairs, some people will have it, just as some people are allergic to pollen, perfume and penicillin. Bring it if it is suitable, but don't bring it if you are allergic.