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Rash on eyebrows and periumbilical region.

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The 5 most common contact allergens identified in patch testing are nickel, fragrance mix, neomycin, balsam of Peru, and thimerosal. These allergens are prevalent among patients undergoing dermatological evaluation for suspected contact dermatitis.

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Area of Science:

  • Dermatology
  • Allergology
  • Toxicology

Background:

  • Contact dermatitis is a common skin condition.
  • Identifying causative allergens is crucial for effective management.
  • Patch testing is a standard diagnostic tool.

Observation:

  • Over 3700 known contact allergens exist.
  • Patch testing was performed on a cohort of patients.
  • Prevalence data for common allergens were collected.

Findings:

  • Nickel was the most prevalent allergen (14.3%).
  • Fragrance mix (14%), neomycin (11.6%), balsam of Peru (10.4%), and thimerosal (10.4%) were also highly prevalent.
  • These five allergens account for a significant proportion of positive patch tests.

Implications:

  • Highlights key allergens for clinical awareness and avoidance.
  • Informs public health initiatives regarding common sensitizers.
  • Suggests a need for reformulation or labeling of products containing these allergens.