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Drug Toxicity: Allergic Reactions

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...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Skin Diseases and Disorders

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...

Changes in Skin Color: Clinical Perspectives

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...

Pigmentation

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...

Allergic Drug Reactions

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...

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Related Experiment Video

Updated: May 29, 2026

A Two-Step Pyrolysis-Gas Chromatography Method with Mass Spectrometric Detection for Identification of Tattoo Ink Ingredients and Counterfeit Products

A Two-Step Pyrolysis-Gas Chromatography Method with Mass Spectrometric Detection for Identification of Tattoo Ink Ingredients and Counterfeit Products

Published on: May 22, 2019

[Skin reactions to tattoo ink].

C Piérard-Franchimont¹, J-F Hermanns, G E Piérard

¹Service de Dermatopathologie, CHU de Liège, Belgique. gerald.pierard@ulg.ac.be

Revue Medicale De Liege

|September 28, 2011

Summary

Tattoo inks contain pigments that can cause allergic reactions like contact dermatitis and photodermatitis. Inflamed tattoos require caution during removal, as laser treatments may worsen reactions.

Area of Science:

Dermatology
Toxicology
Cosmetic Science

Context:

Tattoos utilize diverse pigments, some of which are not inert after dermal injection.
Emerging tattoo ink compounds present identification challenges.
Adverse skin reactions to tattoo pigments are varied and can be complex.

Purpose:

To identify the compositions of tattoo inks.
To characterize the range of allergic and inflammatory reactions associated with tattoo pigments.
To evaluate the suitability of tattoo removal procedures for inflamed tattoos.

Summary:

Tattoo inks contain various pigments, with some new compounds being less understood.
Reactions include allergic contact dermatitis, photodermatitis, hypersensitivity, lichenoid, granulomatous, and pseudolymphoma responses.

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Last Updated: May 29, 2026

A Two-Step Pyrolysis-Gas Chromatography Method with Mass Spectrometric Detection for Identification of Tattoo Ink Ingredients and Counterfeit Products

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Photolysis during tattoo removal can exacerbate reactions in inflamed tattoos, and stratum corneum staining may cause photoeczema.

Impact:

Highlights the potential for adverse reactions to tattoo pigments.
Informs dermatologists and patients about risks associated with tattoo inks and removal.
Emphasizes the need for careful assessment of inflamed tattoos before considering removal procedures.