Seven cases of contact dermatitis due to stearyl alcohol contained in topical medications.

Stearyl alcohol is found in various cosmetics and topical medications and is regarded as safe. Allergic contact dermatitis is reported due to this chemical on rare occasions. We report seven cases, comprising three men and four women aged between 36 and 62 between the years 2013 to 2019, of allergic contact dermatitis due to the use of topical medication, where the patient showed a positive result to a patch test using stearyl alcohol.

Patch testing with the Japanese baseline series 2015: A 4-year experience.

Background: The Japanese baseline series (JBS), established in 1994, was updated in 2008 and 2015. The JBS 2015 is a modification of the thin-layer rapid-use epicutaneous (TRUE) test (SmartPractice Denmark, Hillerød, Denmark). No nationwide studies concerning the TRUE test have previously been reported.

Multicenter 1-month follow-up study of the patch-test reaction to the gold sodium thiosulfate of the TRUE Test and its association with piercings and dental metal history.

Background: There is controversy over late and long-lasting reactions to gold sodium thiosulfate (GST).

Objectives: To study the GST patch-test reaction by observing the application site after 1 month, and to clarify the relevance of GST sensitization by piercings and dental metals.

Patients: A retrospective analysis was performed on 746 patients (143 male; 603 female) who were patch tested using GST of the TRUE Test.

HLA-DQ and RBFOX1 as susceptibility genes for an outbreak of hydrolyzed wheat allergy.

Background: Food allergy is a growing health problem worldwide because of its increasing prevalence, life-threatening potential, and shortage of effective preventive treatments. In an outbreak of wheat allergy in Japan, thousands of patients had allergic reactions to wheat after using soap containing hydrolyzed wheat protein (HWP).

Objectives: The aim of the present study was to investigate genetic variation that can contribute to susceptibility to HWP allergy.

A multi-institutional joint study of contact dermatitis related to hair colouring and perming agents in Japan.

Background: In Japan, allergic contact dermatitis caused by hair colouring agents is a considerable problem for those occupationally exposed and also for consumers. Over the last 20 years, p-phenylenediamine (PPD) has been a common allergen, with ∼7% positive patch test reactions.

Objectives: To investigate which ingredients caused allergic contact dermatitis related to hair dye and perming solutions in Japan, to assess whether PPD is suitable for screening for hair dye allergy, and to propose allergens for a Japanese hairdresser series.