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Updated: Jan 30, 2026
Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
Published on: September 26, 2022
Methylisothiazolinone allergic contact dermatitis: Assessment of relapses in 139 patients after avoidance advice
Pauline Bouschon1, Julie Waton2, Bruno Pereira3
1Department of Dermatology, CHU, Université Clermont-Auvergne, Clermont-Ferrand, France.
Background:
Methylisothiazolinone (MI) is a preservative that is responsible for an epidemic of allergic contact dermatitis (ACD). Few studies have been published on the prognosis of patients with MI-induced ACD.
Objectives:
To evaluate relapses of MI-induced ACD and difficulties in avoiding MI in patients who had received avoidance advice.
Methods:
A retrospective study of patients with MI-induced ACD diagnosed in two specialized dermato-allergology units between 2010 and 2015 was performed. The median follow-up was 3 years.
Results:
Relapses were observed in 64% of 139 included patients, and were severe in 18%. Rinse-off cosmetics were responsible for the largest proportion of relapses (27%). The median time to relapse was 5 months. Sixty-nine per cent of relapses were on the hands, and 29% were on the face. Risk factors for relapsing were hand eczema and a personal history of atopy. The main difficulties encountered in the avoidance strategy were hidden sources of MI, the lack of labelling on industrial products, the complexity of cosmetic labelling, and remembering the name of the allergen.
Conclusion:
MI-induced ACD has a poor prognosis. Its high rate of relapse is mainly attributable to the difficulties of avoidance. Management needs to be improved. Specialized follow-up in the year following diagnosis is essential to educate patients.
Insights
Methylisothiazolinone (MI) allergy causes frequent relapses of allergic contact dermatitis (ACD). Difficulty avoiding MI in products leads to a poor prognosis for patients with MI-induced ACD.
Area of Science:
- Dermatology
- Allergology
- Toxicology
Background:
- Methylisothiazolinone (MI) is a common preservative linked to widespread allergic contact dermatitis (ACD).
- Prognosis data for patients with MI-induced ACD remains limited.
- MI allergy contributes to a significant public health concern regarding skin sensitization.
Purpose of the Study:
- To investigate the relapse rates of MI-induced ACD.
- To identify challenges patients face in avoiding MI exposure.
- To assess the long-term outcomes for individuals with MI-induced ACD.
Main Methods:
- Retrospective analysis of 139 patients diagnosed with MI-induced ACD.
- Data collected from two specialized dermato-allergology units (2010-2015).
- Median follow-up period of 3 years post-diagnosis.
Main Results:
- A high relapse rate of 64% was observed, with 18% experiencing severe reactions.
- Rinse-off cosmetics were the primary source of relapse (27%), with median time to relapse at 5 months.
- Hand eczema and personal history of atopy were identified as risk factors for relapse; challenges included hidden MI sources and complex labeling.
Conclusions:
- MI-induced ACD has a poor prognosis due to high relapse rates.
- Difficulties in avoiding MI, stemming from hidden sources and labeling issues, significantly contribute to relapses.
- Improved management strategies, including specialized patient education within the first year of diagnosis, are crucial.
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