Abstract
Chronic irritant contact dermatitis (ICD) is a common skin disease, especially in the workplace, but determining the recovery time of chronic ICD is not easy. To measure the recovery time of chronic ICD, we examined the skin reactivity to a model surfactant, sodium lauryl sulfate (SLS), on previous chronic ICD and normal sites by visual grade and non-invasive instruments. Chronic ICD was induced on the forearms of 10 volunteers (aged 23 to 43 years) by occluded application of 1% SLS for 30 min on 5 consecutive days each week for 3 weeks. Previous ICD and normal sites were provoked by the occluded application of 7.5% SLS for 30 min daily on 4 consecutive days, 2, 5 and 10 weeks after induction. Skin reactivity was assessed daily by awarding visual erythema scores, visual scale scores and measuring transepidermal water loss, skin color reflectance, and electrical capacitance. Skin reactivity of previous chronic ICD sites to SLS showed hyperreactivity compared to normal sites even after the 10th week post-induction.
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