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Related Concept Videos

Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

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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.
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Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
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Skin Diseases and Disorders01:23

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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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Allergic Drug Reactions01:27

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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...
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Drug Toxicity: Dose-Dependent Reactions01:24

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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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Drug Toxicity: Allergic Reactions01:30

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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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Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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Related Experiment Video

Updated: May 6, 2026

Granulocyte-dependent Autoantibody-induced Skin Blistering
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Drug-induced skin disease.

A P Kaplan

    The Journal of Allergy and Clinical Immunology
    |October 1, 1984
    PubMed
    Summary

    Drug-induced skin reactions vary widely, including delayed hypersensitivity contact dermatitis and urticarial rashes. Mechanisms involve immune responses like IgE-mediated reactions or immune complexes, leading to diverse cutaneous manifestations.

    Area of Science:

    • Dermatology
    • Immunology
    • Pharmacology

    Background:

    • Drug-induced cutaneous reactions present diverse rashes based on administration route and immune mechanisms.
    • Type IV immunologic reactions manifest as contact dermatitis from topical drugs.
    • Systemic drug administration can cause nonspecific pruritus, maculopapular eruptions, or exfoliative dermatitis.

    Purpose of the Study:

    • To review the various types of drug-induced cutaneous reactions.
    • To discuss the underlying immunologic mechanisms.
    • To highlight the clinical presentations and potential outcomes.

    Main Methods:

    • Literature review of drug-induced skin reactions.
    • Analysis of immunologic pathways involved.
    • Categorization of reactions based on clinical presentation and mechanism.

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    Main Results:

    • Reactions include delayed hypersensitivity (contact dermatitis) and urticarial types (urticaria, erythema multiforme, Stevens-Johnson syndrome).
    • Mechanisms involve IgE-mediated reactions, immune complexes (IgG), and potentially cellular reactions.
    • Systemic reactions can range from mild pruritus to severe exfoliative dermatitis.

    Conclusions:

    • Drug-induced skin reactions are complex, involving diverse immune responses.
    • Understanding these mechanisms is crucial for diagnosis and management.
    • Further research may elucidate unclear pathogenetic pathways.