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PubMed1991

Allergic contact dermatitis from eosin.

Before 1960, eosin sensitivity was not rare and lipstick cheilitis was very common. We report 4 patients seen in 1988 and 1989 who were sensitized to eosin from topical bacteriostatic preparations. All 4 patients had positive patch tests to eosin. The allergen is probably an impurity rather than eosin itself.

Adult↗
PubMed1991

Nickel-sulphate-induced contact dermatitis in the guinea pig maximization test: a dose-response study.

Nickel sulphate is a sensitizer in guinea pigs, but the frequency of sensitization varies from study to study. The dose-response relationship for NiSO4.6H2O was evaluated in the guinea pig maximization test in this study. 6 intradermal (0.01%-3.0% aq.) and 6 topical (0.25%-10.0% pet.) concentrations were chosen for induction and NiSO4.6H2O 1% pet. was used for challenge, based on the absence of skin irritation in a pilot study. Blind reading was performed. A logistic dose-response model was applied to the challenge results. At 48 h, a linear relationship was obtained between the intradermal induction dose (but not topical dose) and the response, resulting in a maximum sensitization rate of 40% after 3% i.d. The reactivity disappeared at re-challenge 1 week later. Following a booster closed patch on day 35, using NiSO4 10% pet., the animals were challenged with NiSO4 2% pet. and statistical analyses of 72-h readings revealed a non-linear dose-response relationship, giving a maximum response frequency of 40% after initial induction with NiSO4 3% i.d. and 2% topical.

Administration, Cutaneous↗