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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Skin Diseases and Disorders01:23

Skin Diseases and Disorders

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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
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Related Experiment Video

Updated: Apr 10, 2026

Recognition of Epidermal Transglutaminase by IgA and Tissue Transglutaminase 2 Antibodies in a Rare Case of Rhesus Dermatitis
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Symptomatic Dermatographism Misattributed to Cockroach Exposure: A Diagnostic Pitfall.

Simona Kogan1, Sumeet Bhardwaj2, Suchana Ghimire3

  • 1Dermatology, Philadelphia College of Osteopathic Medicine (PCOM), Philadelphia, USA.

Cureus
|April 9, 2026
PubMed
Summary

Cockroach allergens can trigger respiratory issues, but skin symptoms like hives may indicate physical urticaria, not a true allergy. Careful evaluation is crucial to avoid misdiagnosis and unnecessary allergy testing.

Area of Science:

  • Allergy and Immunology
  • Dermatology
  • Environmental Health

Background:

Keywords:
allergic reactionclaritincockroach exposurecutaneous hypersensitivitydermatographiadermatographism-physical urticariadiagnostic pitfallenvironmental triggererythematous rashpruritus

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  • Allergen exposure presents diverse clinical symptoms, including respiratory diseases and skin manifestations.
  • Cockroach allergens are common in urban environments and typically linked to IgE-mediated respiratory conditions.
  • Diagnosing allergic reactions solely on exposure history can be misleading, especially with cutaneous symptoms.