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Patch test dose–response study of p ‐phenylenediamine: thresholds and anatomical regional differences
Author(s) -
Sosted Heidi,
Menné Torkil,
Johansen Jeanne Duus
Publication year - 2006
Publication title -
contact dermatitis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 96
eISSN - 1600-0536
pISSN - 0105-1873
DOI - 10.1111/j.0105-1873.2006.00803.x
Subject(s) - patch test , medicine , p phenylenediamine , test (biology) , skin test , dermatology , allergy , pathology , materials science , immunology , biology , composite material , tuberculosis , paleontology
The elicitation response in allergic contact dermatitis for the hair dye substance p ‐phenylenediamine (PPD) is dose dependent, but threshold concentrations have not previously been investigated. 15 PPD‐sensitive patients participated in a serial dilution 48‐hr patch test with PPD using 8 concentrations of PPD ranging from 1 to 10 000 on the upper back. Petrolatum was applied as control. Three concentrations (50, 100 and 500 p.p.m. PPD) were also applied to the retroauricular area and on the lateral aspects of the upper arms. 14 of the 15 participants reacted to one or more of the test samples. The threshold value for 10% of the tested persons (ED 10 ) based on + or stronger reactions for PPD on the back was 38 p.p.m. (CI: 4.3–100). There were no statistically significant differences in the sensitivity of the three anatomical regions. The upper back is a suitable region for patch testing patients with hair dye dermatitis.