Use metal instruments such as scissors, kitchen utensils, and combs that have plastic or wooden handle grips.A clue to cobalt-containing jewellery is a dark silver rather than shiny appearance. The presence of cobalt in a metal object can be confirmed using a commercial 2-nitroso-1-naphthol-4-sulfonic acid spot-test. Identify potential sources of exposure at work using material safety data sheets. What is the treatment for cobalt allergy?Ĭobalt allergy is treated by identifying and avoiding the source of exposure. Allergic contact dermatitis to other metals such as nickel and chromate.What is the differential diagnosis for cobalt allergy? Rarely, intradermal tests or oral challenge tests may be appropriate. Purpuric patch test reactions are peculiar to cobalt due to a poral reaction to cobalt accumulation in the eccrine glands and are not indicative of cobalt allergy. Photopatch testing with cobalt is required if a photocontact dermatitis is suspected. A positive reaction to nickel is likely to be due to dual sensitisation rather than cross-reactivity.Ĭobalt naphthenate used in the polyester resin and plastics manufacturing industries can also cause an allergic contact dermatitis, but this may not be detected by the standard patch test with cobalt chloride. Pain and loosening of the implant have been reported.Īllergic contact dermatitis due to cobalt is diagnosed on patch testing with 1% cobalt chloride hexahydrate. Orthopaedic and other implanted metal devices can sometimes result in intractable generalised dermatitis in cobalt-allergic patients. Vitamin B12 injections (cyanocobalamin) can also cause local injection site reactions, hand dermatitis, and anaphylaxis. Patients with allergic contact dermatitis to cobalt taking oral vitamin B12 (cobalamin) supplements may develop chronic vesicular hand dermatitis, cheilitis, stomatitis, or systemic contact dermatitis.Secondary bacterial infection or autoeczematisation of the dermatitis.What are the complications of cobalt allergy?
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