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Petechial reaction following patch testing with cobalt

H Schmidt, F S Larsen, P O Larsen

    Contact Dermatitis
    |January 1, 1980
    PubMed
    Summary
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    Patch testing with cobalt chloride can cause petechial reactions in some patients. Retesting confirmed reproducibility in about 60%, suggesting primary irritation in predisposed individuals.

    Area of Science:

    • Dermatology
    • Allergy and Immunology
    • Toxicology

    Background:

    • Patch testing is a common diagnostic tool for allergic contact dermatitis.
    • Cobalt chloride is a frequent contact allergen.
    • Petechial reactions during patch testing are not fully understood.

    Purpose of the Study:

    • To investigate the reproducibility and nature of petechial reactions induced by cobalt chloride patch testing.
    • To determine if these reactions are indicative of allergic contact dermatitis or primary irritation.

    Main Methods:

    • 132 patients with positive petechial reactions to cobalt chloride 1% in petrolatum were identified.
    • 23 of these patients underwent retesting with varying cobalt concentrations.
    • Histopathological examination of reaction sites was performed.

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    Main Results:

    • A petechial reaction to cobalt chloride was observed in 132 patients.
    • The petechial reaction was reproducible in approximately 60% of retested patients.
    • Histopathology revealed perivascular lymphocytic infiltration, endothelial swelling, and erythrocyte extravasation, but no vasculitis.

    Conclusions:

    • The petechial reaction to cobalt chloride patch testing may represent primary irritation in susceptible individuals.
    • These findings suggest that petechial reactions alone may not always indicate allergic contact dermatitis.
    • Further investigation into the mechanisms of irritant contact dermatitis is warranted.