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Systemically induced (hematogenous) contact eczema.

F Klaschka1, J Ring

  • 1Department of Allergy and Dermatology, Free University of Berlin, W. Germany.

Seminars in Dermatology
|September 1, 1990
PubMed
Summary
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Systemically induced eczema, also known as hematogenous contact eczema, occurs when contact allergens cause skin reactions internally. Diagnosis and allergen avoidance are key for managing this condition.

Area of Science:

  • Dermatology
  • Immunology

Background:

  • Contact allergens administered orally or parenterally can induce eczematous skin reactions internally in sensitized individuals.
  • This phenomenon is termed systemically induced eczema or hematogenous contact eczema.
  • The clinical and dermatopathological features resemble classical allergic contact eczema.

Purpose of the Study:

  • To describe the characteristics of systemically induced eczema.
  • To highlight the underlying pathophysiology and common triggers.
  • To emphasize diagnostic and therapeutic strategies.

Main Methods:

  • Clinical observation and dermatopathological analysis of patients with systemically induced eczema.
  • Review of known contact allergens implicated in this condition.

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Main Results:

  • Skin lesions are often symmetrical, frequently affecting the face or anogenital area.
  • Pathophysiology involves T-lymphocytes and cytokine secretion, akin to the 'flare-up' phenomenon.
  • Key allergens include metal salts, drugs, phytoallergens, and balsam of Peru.

Conclusions:

  • Systemically induced eczema presents clinically and pathologically similar to allergic contact eczema.
  • Effective management relies on accurate diagnosis and strict avoidance of the specific causative allergen.