Common Allergens
The most frequent allergen that was recorded in many research studies all around the world is Nickel. Nickel allergy is more prevalent in young women and it is especially associated with ear piercing or any nickel-containing watch, belt, zipper or jewelry. Other common allergens are surveyed in North America by the North American Contact Dermatitis Group (NACDG).
The latest update of top allergens from 2005-2006 were: Nickel sulfate (19.0%), Myroxylon pereirae (balsam of Peru, 11.9%), fragrance mix I (11.5%), quaternium-15 (10.3%), neomycin (10.0%), bacitracin (9.2%), formaldehyde (9.0%), cobalt chloride (8.4%), methyldibromoglutaronitrile/phenoxyethanol (5.8%), p-phenylenediamine (5.0%), potassium dichromate (4.8%), carba mix (3.9%), thiuram mix (3.9%), diazolidinyl urea (3.7%), and 2-bromo-2-nitropropane-1,3-diol (3.4%)
Read more about this topic: Patch Test (medicine)
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—William Butler Yeats (1865–1939)