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Related Concept Videos

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...
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While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
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A Two-Step Pyrolysis-Gas Chromatography Method with Mass Spectrometric Detection for Identification of Tattoo Ink Ingredients and Counterfeit Products
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[Temporary henna tattoos: Sometimes serious side effects].

Nicolas Kluger1, Nadia Raison-Peyron, Bernard Guillot

  • 1Université Montpellier I, Service de dermatologie, Hôpital Saint-Eloi, CHU de Montpellier, F-34295 Montpellier Cedex 5, France.

Presse Medicale (Paris, France : 1983)
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PubMed
Summary

Black henna tattoos, popular with tourists, often contain para-phenylenediamine (PPD). This allergen can cause severe skin reactions, including scarring and allergic responses, necessitating consumer awareness and patch testing.

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Area of Science:

  • Dermatology
  • Allergology
  • Toxicology

Context:

  • Temporary henna tattoos are increasingly popular among Western tourists, particularly children and young adults.
  • Natural henna yields a brownish-orange color and has low allergic potential.
  • Black henna tattoos utilize para-phenylenediamine (PPD) to achieve darker colors and faster application.

Purpose:

  • To highlight the risks associated with para-phenylenediamine (PPD) in black henna tattoos.
  • To inform about the potential adverse reactions and complications.
  • To emphasize the need for consumer education and regulatory oversight.

Summary:

  • Para-phenylenediamine (PPD) in black henna tattoos is a potent allergen responsible for various dermatological complications, including contact dermatitis, scarring, and dyspigmentation.
  • Severe allergic reactions, such as urticaria, angioedema, and anaphylaxis, can occur, with PPD allergy potentially cross-reacting with hair dyes and azo dyes.
  • Accurate patch testing for PPD requires a very dilute concentration (0.01% in vaseline) to prevent sensitization and adverse reactions.

Impact:

  • Increased awareness among consumers, especially young people and parents, about the dangers of black henna tattoos.
  • Potential for regulatory bodies to implement controls on henna tattooing practices.
  • Reduced incidence of PPD-induced allergic contact dermatitis and other adverse effects associated with temporary tattoos.