• nickel;
  • cobalt;
  • chromate;
  • metal allergy;
  • ear piercing;
  • atopy;
  • schoolchildren;
  • allergic contact dermatitis

In 424 schoolchildren (223 boys and 201 girls) aged 7–12 years undergoing routine patch tests, 21.0% (89 children), 38.8% (78/201) of girls and 4.9% (11/223) of boys, had had their ears pierced. 18.6% (79 children, 55 girls and 24 boys) gave a history of cutaneous reactions to metallic jewellery, and in 17.2% (73 children, 49 girls and 24 boys), sensitivity to one or more metals was confirmed. Metal allergy was confirmed by patch testing in only 34.2% of the children with a history of metal dermatitis, and 13.3% of those without a history of metal reactions had, in fact, positive patch tests to 1 or more metals. The low sensitivity (37.0%) and low positive predictive value (34.2%), together with high specificity (85.2%) and high negative predictive value (86.7%), seem to justify dermatological examination of individuals with a positive symptom-based diagnosis only. Nickel sensitivity was found in 14.9% (63 children, 44 girls and 19 boys). There is clearly a relationship between ear piercing and induction of nickel allergy in girls, as nickel sensitivity in girls with pierced ears was 2 × (30.8%) that found in those without (16.3%) pierced ears. In boys, nickel sensitivity was much less frequent and few cases were related to ear piercing. Atopy appeared to influence the propensity for developing metal sensitivity in girls, as atopic girls showed positive metal tests 2xas frequently (30.8%) as non-atopic (17.0%). No such differences were found in boys. Girls with a combination of atopy and ear piercing showed the highest frequency of positive metal tests (45.5%). The frequency of metal allergy increased with increasing number of holes in the ear lobes. Symptoms of nickel allergy were reported in 30.2% (19/63) of mothers whose children had nickel allergy, compared to 16.3% (59/361) of mothers whose children had negative nickel tests. Only 4 children reported symptoms of nickel allergy in their father. The high frequency of nickel sensitivity in all children tested may indicate an influence of sources other than ear piercing.