You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Commonest metal causing skin hypersensitivity? and explain in detail?
Metal dermatitis is most frequently caused by nickel, chromates and mercury. Nickel is naturally present in food (green leafy vegetables) and also present in jewellery, household equipment, wearing apparel and industry.