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| 2. |
- Brynolf, Andreas, et al.
(author)
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Contact allergy investigations in healthcare workers with face mask-related skin disease
- 2023
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In: Contact Dermatitis. - 0105-1873. ; 89:1, s. 16-19
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Journal article (peer-reviewed)abstract
- Background: During the COVID-19 pandemic, the use of face masks has increased among healthcare workers (HCWs). Questionnaire studies have shown a high frequency of self-reported facial adverse skin reactions. Case reports have been published on face mask-induced allergic contact dermatitis and urticaria. Objectives: To describe the results of the contact allergy investigations in consecutive HCWs investigated for skin reactions to face masks during the COVID-19 pandemic and the results of the chemical investigations of face masks supplied by the hospital. Methods: Participants were patch tested with baseline series and chemicals previously reported in face masks not included in the baseline series. Face mask(s) brought by the HCW were tested as is and/or in acetone extract. Chemical analyses were performed on nine different face masks for potential allergens. Results: Fifty-eight HCWs were investigated. No contact allergies were found to the face mask(s) tested. Eczema was the most common type of skin reaction, followed by an acneiform reaction. Colophonium-related substances were found in one respirator and 2,6-di-t-butyl-4-methylphenol (BHT) were found in two respirators. Conclusion: Based on this report, contact allergies to face masks is uncommon. Patch test with colophonium-related substances and BHT should be considered when investigating adverse skin reactions to face masks.
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| 3. |
- Isaksson, Marléne, et al.
(author)
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Active sensitization to dimethylthiocarbamylbenzothiazol sulphide : An unexpectedly strong rubber contact allergen
- 2023
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In: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 88:6, s. 472-479
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Journal article (peer-reviewed)abstract
- Background: The two dialkylthiocarbamyl benzothiazole sulphides, dimethyl-thiocarbamylbenzothiazole sulphide (DMTBS) and diethylthio-carbamylbenzothiazole sulphide (DETBS) were shown to be good markers of both thiuram and mercaptobenzothiazole sensitivity. Objectives: To investigate if DMTBS and/or DETBS could be better markers of contact allergy to common rubber additives than the ones currently used. Methods: Sixty-eight dermatitis patients were patch tested with DMTBS and DETBS, both at 1% in petrolatum (pet). Because of late reactions in 10 patients, these were retested to DMTBS and DETBS in serial dilutions. Tetramethylthiuram monosulphide (TMTM) 1.0% pet was also tested. Results: At the initial reading Days 3 and 7, no reactions were noted to DMTBS or DETBS. At retesting, 10 of the 68 (15%) patients reacted positively to lower concentrations of DMTBS than the initial test concentration. Seven of 8 also reacted to TMTM. Three of them had positive reactions to DEBTS. All 10 patients had reactions to more diluted solutions to DMBTS than to DEBTS (p = 0.0077; Mc-Nemar test, two-sided). Conclusions: Results speak for patch test sensitization to DMTBS with cross-reactivity to TMTM and also DEBTS. DMTBS and DEBTS could be new markers of rubber allergy but a safe test concentration must be found.
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- Sukakul, Thanisorn, et al.
(author)
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Contact allergy to oxidized linalool and oxidized limonene : Patch testing in consecutive patients with dermatitis
- 2022
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In: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 86:1, s. 15-24
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Journal article (peer-reviewed)abstract
- BACKGROUND: Contact allergy to oxidized (ox.) linalool and ox. limonene has been reported to have a high prevalence, raising the question of inclusion into the baseline series. However, several important issues should be clarified and further investigated before inclusion can be warranted.OBJECTIVES: To report the trends of ox. terpenes allergy in patients with dermatitis, features of the patch test reactions, and clinical characteristics of the patients.METHODS: A retrospective analysis of 5773 patients was performed. All patients were patch tested with baseline series, individual ingredients of fragrance mix I and II, ox. linalool, and ox. limonene from 2013 to 2020.RESULTS: The prevalence rates of contact allergy to ox. linalool and ox. limonene were 7.0% and 5.1%, respectively. Significantly increasing trends of contact allergy were observed. More than 95% of contact allergy cases were identified on Day 3/4. Patients with contact allergy to ox. linalool and ox. limonene were significantly younger than those with contact allergy to other fragrances and were predominantly female. Strong reactions were associated with older age and multiple fragrance allergies.CONCLUSIONS: Contact allergy to ox. linalool and ox. limonene is becoming increasingly important, and findings show intriguing features. More studies concerning the clinical relevance before recommending these substances for screening are required.
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| 5. |
- Sukakul, Thanisorn, et al.
(author)
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Contact allergy to polyhexamethylene biguanide (polyaminopropyl biguanide)
- 2021
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In: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 84:5, s. 326-331
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Journal article (peer-reviewed)abstract
- Background: Polyaminopropyl biguanide (INCI name) and polyhexamethylene biguanide (PHMB) are polymeric biguanides. PHMB is a broad-spectrum antimicrobial substance used as a preservative in many products. Due to our limited knowledge on PHMB contact allergy frequency and the fact that cases of allergic contact dermatitis to PHMB might be missed, we have included PHMB as a screening allergen since 2016. Objective: To report the prevalence of positive patch-test reactions to PHMB as a screening allergen in patients with suspected allergic contact dermatitis. Methods: A retrospective analysis of 1760 patch tested patients from July 2016 to December 2018 was performed. Polyaminopropyl biguanide 2.0% aqua was included in the extended Malmö baseline series during the study period. Results: Of all patients, 1204 (68.4%) were female. Positive patch-test reactions were reported in 19 patients (1.1%). The most common sites of lesions were face, head, and neck (52.6%). There was a significant correlation between concomitant reactions to PHMB and other cosmetic-related allergens. Conclusion: The prevalence of positive reactions to PHMB was higher than that previously reported. Patch testing with PHMB should be performed in patient with dermatitis who have lesions on the face, head, and neck.
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| 6. |
- Sukakul, Thanisorn, et al.
(author)
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Simultaneous patch testing with fragrance markers in the baseline series and the ingredients of fragrance mixes : An update from southern Sweden
- 2022
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In: Contact Dermatitis. - : Wiley. - 0105-1873 .- 1600-0536. ; 86:6, s. 514-523
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Journal article (peer-reviewed)abstract
- BACKGROUND: Regularly updating the prevalence of fragrance contact allergy (CA) is important. Patch testing with fragrance markers in the baseline series and the ingredients of fragrance mixes (FMs) is still debated.OBJECTIVES: To update the prevalence and clinical characteristics of patients with fragrance CA. To establish the results of patch testing with individual allergens of FMs.METHODS: A retrospective analysis of 3539 patients with dermatitis who were patch tested with the baseline series and FMs ingredients during 2016 to 2020 was performed.RESULTS: The prevalence of fragrance CA was 13%. About 10% of these patients with fragrance CA would be missed if the individual ingredients were not tested. Unlike hydroxyisohexyl 3-cyclohexene carboxaldehyde, there was no decreasing trend of CA to Evernia prunastri (oakmoss) extract after the EU regulation came into force. Patients with CA from only one ingredient of the mixes or having a weak positive reaction to the ingredients were significantly missed when tested with only the fragrance markers in the baseline series.CONCLUSIONS: Patch testing with individual fragrance allergens is crucial for experts to expand knowledge in the fragrance CA field. The concentrations of the allergens in FMs may need to be adjusted to detect patients with fragrance CA, since some were significantly overlooked.
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