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Hypersensitivities

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 Reactions

Allergic Reactions

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Related Experiment Video

Updated: Feb 2, 2026

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Published on: September 26, 2022

Immediate hypersensitivity to p-phenylenediamine

Mark Wilkinson¹, Lea Solman¹, Pieter-Jan Coenraads²

¹Department of Dermatology, Leeds Teaching Hospitals NHS Trust, Leeds, UK.

Contact Dermatitis

|November 15, 2018

Summary

No abstract available in PubMed .

Keywords:

anaphylaxis case report hair dye immediate hypersensitivity p-phenylenediamine

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