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Diagnosis and Prevalence of Lanolin Allergy

Miest, Rachel Y. N. MD*; Yiannias, James A. MD; Chang, Yu-Hui H. PhD; Singh, Nidhi RN

doi: 10.1097/DER.0b013e3182937aa4
Studies

Background Current evaluation of suspected allergic contact dermatitis to lanolin includes patch testing to lanolin alcohol (30% in petrolatum). Using this method, the prevalence of lanolin allergy is low (1.8%–2.5%).

Objective The objective of this study was to determine whether patch testing to a single lanolin derivative results in underdiagnosis compared with patch testing to 12 lanolin derivatives.

Methods Patients were prospectively patch tested to (1) lanolin alcohol (30% in petrolatum) in our standard allergen series; (2) Amerchol L101 (50% in petrolatum) in our cosmetic series; and (3) 10 lanolin derivatives (using concentrations and vehicles recommended in the literature) in a supplemental series.

Results Of 286 patients, the overall prevalence of positive reactions to lanolin in at least 1 of the 3 patch test series was 6.29% (95% confidence interval [CI], 3.48%-9.11%) (n = 18). The prevalence rates of lanolin allergy using the standard, cosmetic, and supplemental series were 1.05% (95% CI, 0%–2.23%), 3.85% (95% CI, 1.62%–6.07%), and 3.85% (95% CI, 1.62%–6.07%), respectively. Amerchol L101 was associated with increased reaction rates compared with the standard (odds ratio, 3.81; P = 0.007) and supplemental (odds ratio, 8.85; P < 0.001) series, whereas reaction rates were similar for the standard and supplemental series (P = 0.78).

Conclusions Amerchol L101 and patients’ own products should be added to a standard patch testing allergen series to adequately identify lanolin allergy.

From the *Department of Dermatology, Mayo Clinic, Rochester, MN; and †Department of Dermatology and ‡Division of Health Sciences Research, Mayo Clinic, Scottsdale, AZ.

Address reprint requests to James A. Yiannias, MD, Department of Dermatology, Mayo Clinic, 13400 E Shea Blvd, Scottsdale, AZ. E-mail: yiannias.j@mayo.edu.

Portions of the Methods section were published previously in Arch Dermatol (2008;144(1):67–72), copyright transferred from ©2013 Mayo Foundation for Medical Education and Research.

Dr Yiannias has received royalties from Preventice, Inc. The other authors have no funding or conflicts to declare.

© 2013 American Contact Dermatitis Society
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