FORMALDEHYDE contact allergy stays a major concern amongst sufferers with dermatitis regardless of regulatory efforts to restrict publicity, based on a big systematic evaluation.
Researchers carried out a metanalysis of 158 research involving greater than 1.3 million sufferers with dermatitis to find out the prevalence of contact allergy to formaldehyde and 5 generally used formaldehyde-releasing preservatives. General, 2.88% of sufferers had a formaldehyde contact allergy, with substantial variations noticed between geographical areas.
Formaldehyde Allergy Varies Throughout Areas
Formaldehyde and formaldehyde-releasing preservatives have been extensively used for his or her antimicrobial properties in on a regular basis objects like make-up and hair merchandise and are recognised causes of allergic contact dermatitis. Nonetheless, variations in publicity and regulation between international locations might affect charges of sensitisation.
Researchers in Denmark searched PubMed, Embase, and Internet of Science for related research revealed as much as September 30, 2025.
Throughout 1,347,638 sufferers with dermatitis, the pooled prevalence of formaldehyde contact allergy was 2.88%. Of optimistic reactions, 41.57% have been thought-about clinically related.
Marked geographical variations have been recognized North America had the best prevalence of formaldehyde contact allergy, at 6.8%. In Europe it was 2.3% and its lowest in Southeast Asia at 1.8%, making the North American charge practically 3 times increased than in these areas, highlighting appreciable variation in sensitisation between areas.
Charges have been additionally elevated in South America (5.4%), Africa (5.3%), and East Asia (4.2%), though estimates for some areas have been based mostly on fewer research.
Formaldehyde-Releasing Preservatives Stay Related Allergens
The researchers additionally examined contact allergy to 5 formaldehyde-releasing preservatives. Prevalence was highest for bronopol at 2.76%, adopted by quaternium-15 at 1.89%. Charges have been 1.42% for diazolidinyl urea, 1.37% for DMDM hydantoin, and 1.20% for imidazolidinyl urea.
Amongst these preservatives, quaternium-15 confirmed the best scientific relevance, with 55.67% of optimistic reactions thought-about related to sufferers’ dermatitis.
Age and atopic dermatitis didn’t seem to considerably affect prevalence. Formaldehyde contact allergy was recognized in 2.96% of youngsters and a pair of.61% of adults, with no vital distinction between the teams. Equally, prevalence didn’t differ considerably between sufferers with and with out atopic dermatitis.
Regulation Could Scale back Contact Allergy
The authors highlighted regulatory variations as a possible clarification for geographical variation. Within the European Union, formaldehyde and quaternium-15 are prohibited to be used in beauty merchandise, whereas restrictions additionally apply to different formaldehyde-releasing preservatives.
The findings recommend that such measures might scale back inhabitants publicity and subsequent sensitisation, supporting regulation as an vital technique for stopping allergic contact dermatitis.
The researchers concluded that the substantial geographical disparities noticed in formaldehyde contact allergy underline the potential effectiveness of regulatory interventions in decreasing publicity to clinically vital contact allergens in on a regular basis merchandise.
Reference
Karimian Okay, et al. The prevalence of contact allergy to formaldehyde and formaldehyde releasers: a scientific evaluation and meta-analysis. Contact Dermatitis. 2026. 95(2):125–147.
Featured picture: maxbelchenko on AdobeStock
