Nickel allergic contact dermatitis

The article provides basic information about nickel-associated allergic contact dermatitis (NACD). Nickel is a common metal that is commonly used in alloys for jewelry, accessories and household items. Contact with this metal often leads to the development of allergic contact dermatitis in sensitized individuals. The prevalence of NACD among the population is high: up to 19% among adults and about 10% among children and adolescents. It is noted that in female’s sensitization to nickel is observed several times more often than in males. On the risk of developing an allergic reaction to nickel, the integrity of the skin barrier, the frequency of contacts with nickel-containing household items, the presence of piercings, high humidity and hyperhidrosis are of decisive importance. Nickel ions entering the body through the alimentary route are capable of both sensitizing the body and forming tolerance to it. The pathogenesis of NACD is based on the classic delayed-type hypersensitivity reaction. The main clinical forms of this allergic dermatosis, as well as the characteristic features of the course of the disease are presented. The features of the course of NACD in patients with atopic dermatitis (AD) are analyzed in detail. The presented data clearly demonstrate that contact allergy to nickel can not only maintain, but also significantly aggravate the course of AD. The main criteria for the differential diagnosis between simple contact and allergic contact dermatitis are shown schematically. The need for early identification and termination of contact with nickel-containing household items is noted as the initial stage of NACD treatment. The main treatment for NACD is local therapy with topical glucocorticosteroids.