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Related Experiment Videos

Contact urticaria from rice.

Y Yamakawa1, H Ohsuna, M Aihara

  • 1Department of Dermatology, Yokohama City University Medical Center, Yokohama, Japan.

Contact Dermatitis
|February 24, 2001
PubMed
Summary

Contact urticaria from rice washing water suggests a water-soluble, heat-unstable allergen. Allergen-reduced rice significantly decreased reactions, indicating a specific component in regular rice is responsible.

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Area of Science:

  • Dermatology
  • Allergology
  • Food Science

Background:

  • Atopic dermatitis patients can develop unusual hypersensitivities.
  • Occupational exposures can trigger allergic reactions.

Observation:

  • A 30-year-old man with atopic dermatitis experienced hand erythema and itching after washing rice.
  • Abraded skin exposed to regular rice-washing water caused immediate urticarial erythema.
  • Allergen-reduced rice-washing water did not elicit a reaction.

Findings:

  • Prick tests and histamine release tests showed significantly lower reactivity with allergen-reduced rice water.
  • Immunoblotting did not identify specific bands in regular rice washing water for this patient.
  • The causative allergen is likely water-soluble, heat-unstable, and present in regular rice, but not allergen-reduced rice.

Implications:

  • Identifies a specific allergen in rice washing water causing contact urticaria.
  • Suggests a potential role for processed or allergen-reduced rice in managing such allergies.
  • Highlights the importance of considering environmental and occupational triggers in atopic dermatitis management.

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