Correction: Patch test results in paediatric patients with atopic dermatitis in Laos.

[This corrects the article DOI: 10.1371/journal.pone.0231455.].

Correction: Patch testing in Lao medical students.

[This corrects the article DOI: 10.1371/journal.pone.0217192.].

Patch test results in paediatric patients with atopic dermatitis in Laos.

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.

Patch testing in Lao medical students.

BACKGROUND: Dermatological services in Laos, South East Asia are limited 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 positive patch tests in medical students without evidence of contact dermatitis in Laos. PATIENTS/MATERIALS/METHODS: One hundred and fifty medical students were patch tested using TRUE Test® panels 1 to 3 (35 allergens). Readings were taken at Days 2 and 4. RESULTS: Thirty-eight students (25.3%) had a positive reaction to at least one allergen, accounting for 52 reactions in total. The proportion of the students with positive patch test reading was significantly higher in the female [33/96 (34%)] than in the male [5/54 (9%)], p<0.001. The most common allergens were: nickel (10%), gold (6.6%), thiomersal (6.6%), cobalt dichloride (2%) and p-tert-Butylphenol formaldehyde resin (2%). Balsam of Peru (0.66%), black rubber mix (0.66%), Cl+Me-Isothiazolinone (0.66%), fragrance mix 1 (0.66%), quinolone mix (0.66%), methyldibromo glutaronitrile (0.66%), mercapto mix (0.66%), epoxy resin (0.66%), paraben mix (0.66%), thiuram (0.66%) and wool alcohols (0.66%) accounted for all of the other positive reactions. CONCLUSION: This study represents the first documented patch test results in Lao medical students and in the adult Lao population. The results of this study will inform any future research into contact allergy in Laos and give an insight into the background level of contact sensitivity in this population.

Recent advances in the management of hand dermatitis: does alitretinoin work?

Hand dermatitis can cause significant morbidity. It is not only pruritic, painful, and adversely affects manual dexterity, but it is also very visible, resulting in a substantial psychosocial and physical impact. The prevalence of hand dermatitis in the general population is 5% to 10%, and it appears to be twice as common in women than in men. Certain occupations predispose workers to hand dermatitis, especially those that require frequent hand washing or exposure to particular substances such as solvents. Hand dermatitis has a significant economic effect on society, and the socioeconomic and psychologic effect for the individual can be catastrophic. The need for effective management of this condition is, therefore, quite clear; however, historically hand dermatitis is difficult to treat. This contribution reviews the various types of hand dermatitis and how best to manage them and examines the role which the recently introduced drug alitretinoin now plays in managing this clinically challenging condition.