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Summary Background The association of atopic dermatitis (AD) and allergic contact dermatitis has been a matter of considerable uncertainty. Study results range from lack of any association to increased sensitization for multiple allergens, but fail to identify consistent allergen associations. Objective We studied a large patch test cohort of patients stratified by their atopic skin diathesis using the Erlangen Atopy Score (EAS), independent of active skin disease. Methods Retrospective multi‐center data analysis from five departments of dermatology in Germany with 4,509 patients. Patients were grouped as “no atopic skin diathesis” (n = 2,165) and “atopic skin diathesis” (n = 1,743), according to EAS. Results Significantly more individuals with atopic skin diathesis showed at least one positive patch test reaction to the baseline series compared to individuals without atopic skin diathesis (49.1 % vs. 38.3 %). In logistic regression analyses, atopic skin diathesis was associated with a significantly higher risk of sensitization to methylchloroisothiazolinone/methylisothiazolinone (OR 2.383) and methylisothiazolinone (OR 1.891), thiuram mix (OR 1.614), as well as nickel (OR 1.530), cobalt (OR 1.683), and chromium (OR 2.089). Conclusions Atopic skin diathesis proved to be the most important intrinsic risk factor for contact sensitization to few, specific allergens. Past or present AD was a less relevant variable.

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Background Dermatological services in Laos, South East Asia are limited mainly to the capital and patch testing is currently not available, so no data exists regarding the common cutaneous allergens in this population. Objectives The aim of this study was to document common allergens in paediatric patients with atopic dermatitis attending the allergy clinic in the capital, Vientiane. Patients/materials/methods Fifty paediatric patients with atopic dermatitis were patch tested using TRUE Test® panels 1 to 3 (35 allergens). Readings were taken at Days 2 and 4. Results Twenty-six positive patch tests were recorded on Day 4 in 15 children (30%). The most common allergens were: gold (18%), nickel (10%), formaldehyde (6%) and p-Phenylenediamine (6%). Other positive allergens were potassium dichromate (2%), cobalt dichloride (2%), Bronopol (2%), paraben mix (2%), fragrance mix 1 (2%) and neomycin (2%). The majority of the patients with positive reactions were female. Conclusions This study represents the first documented patch test results in the Lao population. It is hoped that these findings will help clinicians to advise the families of children with atopic dermatitis on common allergens to avoid and inform future work on contact dermatitis in this population.

Aim: The aim of this study is to determine the effect of age at the time of diagnosis on the development of additional allergic diseases and aeroallergen sensitivity in pediatric patients with a diagnosis of AD. Material and Method: The study includes 114 pediatric patients who were diagnosed with atopic dermatitis according to Hanifin and Rajka criteria. After all patients were divided into two groups according to age at the time of diagnosis as less than 24 months and more than 24 months, total serum IgE, inhalant spesific IgE, ECP levels and skin prick tests were made. The additional allergic diseases developed during the follow-up were recorded. Results: 90 patients (78.9%) were under 24 months of age, 24 (21.1%) patients were over 24 months of age according to age at the time of diagnosis. In our study group, mean age at the time of diagnosis was 14.0 +/- 21.4 months, the duration for the development of additional allergic disease was 23.8 +/- 22.3 months and mean follow-up duration was 58.7 +/- 41.2 months (min.8 months - max. 180 months; median 50.5 months). In the group who were under 24 months of age at the time of diagnosis, a significant difference was determined for the development of asthma in the future (p=0.042). Conclusions: To prevent the allergic process in cases in whom atopic dermatitis findings start at an early age, the families should be warned about the allergic diseases associated with the respiratory system and should protect their children from the inhalant allergens.

Triclosan is a lypophilic chlorophenol biocide with broad-spectrum antibacterial and antifungal activity. Triclosan-based topical products have been shown to be tolerated and beneficial in atopic dermatitis. The aim of this study was to evaluate the sensitizing potential of triclosan and triclosan-based creams in patients affected by eczematous dermatitis. Two hundred and seventy-five patients affected by chronic eczema (allergic contact dermatitis, irritant contact dermatitis, atopic eczema, nummular eczema, stasis dermatitis) were patch tested with standard patch test series as well as triclosan and triclosan-based products. Standard patch test series resulted positive in 164 patients (61%), with nickel sulfate, house dust mites, fragrance mix, propolis, thimerosal, myroxylon pereira, potassium dichromate, wool alcohols, and p-phenylenediamine the most common sensitizing haptens. Only two patients developed positive reactions to triclosan (0.7%) and four (1.4%) to triclosan-based products. The present study's results confirm that triclosan is well tolerated and has a very low sensitizing potential even in high-risk patients affected by eczema.