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Related Experiment Videos

Allergic contact dermatitis from formaldehyde in a liquid soap.

A Zemtsov1, J S Taylor, P Evey

  • 1Department of Dermatology, Cleveland Clinic Foundation, Ohio 44195.

Cleveland Clinic Journal of Medicine
|May 1, 1990
PubMed
Summary

Generalized allergic contact dermatitis can be caused by formaldehyde in liquid soaps. This case highlights the importance of patch testing for identifying hidden allergens in personal care products.

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Area of Science:

  • Dermatology
  • Allergology
  • Toxicology

Background:

  • Allergic contact dermatitis is an immune response to external substances.
  • Formaldehyde is a common preservative used in consumer products, including soaps.
  • Identifying the source of contact allergens can be challenging in clinical practice.

Observation:

  • A 74-year-old man presented with generalized allergic contact dermatitis.
  • The patient's condition resolved after discontinuing a liquid soap containing formaldehyde.
  • Patch testing confirmed a positive reaction to formaldehyde at a 0.1% concentration.

Findings:

  • Formaldehyde in liquid soap was identified as the causative agent for allergic contact dermatitis.
  • The allergen was not apparent to the patient or physician prior to diagnostic testing.

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  • The voluntary registration of formaldehyde-containing soaps with the FDA suggests potential underreporting.

    • Implications:

    • Healthcare providers should consider formaldehyde in liquid soaps as a potential cause of allergic contact dermatitis.
    • Increased awareness and potentially regulatory oversight of formaldehyde in consumer products may be warranted.
    • Patch testing is crucial for diagnosing contact dermatitis when the source is not obvious.