<unk> es inflame the skin after it has been in contact with<unk> . They are a form of allergic contact dermatitis. They are becoming more common, , except in areas with regulatory countermeasures. People may become sensitized to certain<unk> s by skin contact, usually by wearing or holding consumer products (including non-metal products, like textiles and leather treated with<unk> s), or sometimes after exposure at work. Contact with damaged skin makes sensitization more likely. Medical implants may also cause allergic reactions. Diagnosis is by patch test, a method which does not work as well for<unk> s as it does for some other allergens. Prevention and treatment consists of avoiding the<unk> n; there is no other treatment, . It can be difficult to identify and avoid the allergen, because many<unk> s are common in the environment, and some are biologically necessary to humans. Regulations have successfully reduced the rates of some<unk> es in Europe, but are not widespread. The social and economic costs of<unk> es are high.<unk> es are type IV allergies; the<unk> s are haptens. The toxicity of some allergenic<unk> s may contribute to the development of allergies.
Metal allergy
Nickel allergy
Food allergy
Sesame allergy
Dust mite allergy
Drug allergy
Animal allergy
Garlic allergy