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Perianal Dermatitis.

Alfredo-Daniel Agulló-Pérez1, Marcos Hervella-Garcés, Saioa Oscoz-Jaime

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Contact allergy is a frequent cause of persistent perianal dermatitis. Patch testing is crucial for diagnosing allergic contact dermatitis, with methylchloroisothiazolinone/methylisothiazolinone being a common allergen.

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Area of Science:

  • Dermatology
  • Allergology
  • Epidemiology

Background:

  • Perianal complaints are common in dermatology, often lacking a clear diagnosis.
  • Differentiating various causes of perianal dermatitis is clinically challenging.

Purpose of the Study:

  • To investigate the epidemiological, clinical, and contact allergy characteristics of patients with perianal dermatitis.
  • To identify common allergens in patients attending a tertiary hospital's contact dermatitis unit.

Main Methods:

  • Adult patients with chronic perianal dermatitis (>4 weeks) were studied over 10 years.
  • Diagnostic workup included dermatological examination, patch testing (standard, specific, and patient's own products), and surgical exploration when indicated.

Main Results:

  • 124 patients were included; main diagnoses were allergic contact dermatitis (32.3%), psoriasis (24.2%), and irritant contact dermatitis (17.7%).
  • 66.1% of patients had positive patch test reactions, with 43% showing relevance to their condition.
  • Methylchloroisothiazolinone/methylisothiazolinone was identified as a frequent allergen.

Conclusions:

  • Contact allergy is a significant factor in chronic perianal dermatitis.
  • Referral to dermatology for patch testing is essential for accurate diagnosis and management.
  • Identifying specific allergens like methylchloroisothiazolinone/methylisothiazolinone aids in targeted treatment.