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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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 exposure to a...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

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: May 7, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
08:02

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation

Published on: March 24, 2023

Cutaneous allergy.

D A McKay1

  • 1DA McKay, Department of Dermatology Lauriston Building Lauriston Place Edinburgh EH3 9HA, UK. davidmckay@nhs.net.

The Journal of the Royal College of Physicians of Edinburgh
|October 3, 2013
PubMed
Summary
This summary is machine-generated.

Cutaneous allergy involves complex immune responses in skin conditions like atopic dermatitis. Many patients with self-diagnosed allergies have non-allergic causes, and allergy testing has limitations.

Keywords:
Food allergyanaphylaxisatopic dermatitisdrug allergyurticaria

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Last Updated: May 7, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

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Area of Science:

  • Immunology
  • Dermatology
  • Clinical Medicine

Background:

  • Cutaneous allergy presents diverse clinical manifestations and immunological underpinnings.
  • Allergy is implicated in atopic dermatitis, contact dermatitis, urticaria, angioedema, anaphylaxis, and adverse drug reactions.
  • Skin symptoms often mimic allergic reactions but may stem from non-allergic conditions.

Purpose of the Study:

  • To explore the complexities of cutaneous allergy.
  • To differentiate true allergic conditions from non-allergic presentations with similar skin phenotypes.
  • To highlight the limitations of current diagnostic investigations for cutaneous allergy.

Main Methods:

  • Review of immunological mechanisms in skin allergy.
  • Analysis of clinical presentations of allergic and non-allergic skin diseases.
  • Evaluation of the diagnostic utility and limitations of allergy testing.

Main Results:

  • A significant proportion of patients self-diagnosing allergy have non-allergic conditions.
  • Current diagnostic tests for cutaneous allergy possess limitations and are prone to misinterpretation.
  • Accurate diagnosis requires careful clinical assessment and experienced interpretation of investigations.

Conclusions:

  • Distinguishing true cutaneous allergy from other skin disorders is challenging.
  • Expertise is crucial for interpreting allergy investigations and managing patients.
  • Further research may improve diagnostic accuracy for skin allergy conditions.