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Clinical experience and patch testing using colophony (rosin) from different sources.

A T Karlberg, C Lidén

    The British Journal of Dermatology
    |October 1, 1985
    PubMed
    Summary
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    Patch testing with multiple colophony (rosin) types identified more allergies. Gum rosins showed higher allergic activity than tall oil rosin, and a 20% concentration was more effective for diagnosis.

    Area of Science:

    • Dermatology
    • Allergology
    • Occupational Health

    Background:

    • Colophony (rosin) is a common contact allergen.
    • Occupational exposure to colophony can cause allergic contact dermatitis.
    • Accurate diagnosis of colophony allergy is crucial for patient management.

    Purpose of the Study:

    • To evaluate the efficacy of different colophony types in patch testing.
    • To determine optimal test concentrations for colophony allergy detection.
    • To identify colophony as the primary cause of occupational eczema.

    Main Methods:

    • Patch testing patients with suspected colophony allergy.
    • Utilizing various colophony preparations including gum rosin and tall oil rosin.
    • Comparing different test concentrations (20% and 5%) of colophony.

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    Main Results:

    • Testing with multiple colophony types increased allergy detection rates.
    • Gum rosins elicited more positive reactions compared to tall oil rosin.
    • A 20% colophony concentration identified more cases than a 5% concentration.

    Conclusions:

    • Comprehensive patch testing with diverse colophony sources is recommended.
    • Tall oil rosin appears to have lower allergenic potential than gum rosins.
    • Occupational contact with colophony is a significant cause of allergic contact dermatitis.