<prompt> Most common metal causing contact dermatitisZincGoldCobaltNickel  <response>: Nickel allergy is one of the most common causes of contact allergic dermatitis. The most common sites for nickel dermatitis are the earlobes from earrings, the wrists from a watch strap and the lower abdomen from a jeans stud; the affected areas become intensely itchy and may become red and blistered acute dermatitis or dry, thickened and pigmented chronic dermatitis. Ref Harrison 20th edition pg 1234 