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Related Experiment Videos

Tumbleweed dermatitis.

R F Powell, E B Smith

    Archives of Dermatology
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Russian thistle, or tumbleweed, can cause skin irritation. Dermatitis occurs from mechanical irritation in most people, but causes an allergic reaction in sensitized individuals.

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    Area of Science:

    • Dermatology
    • Botany
    • Toxicology

    Background:

    • Russian thistle (Salsola kali), commonly known as tumbleweed, is prevalent in the western US.
    • This plant is known to cause dermatitis upon direct contact.

    Observation:

    • Various tests were performed: scratch, patch, and photopatch tests with Russian thistle extract.
    • Tests included mechanical contact with plant branches and scratch tests with potassium nitrate.
    • Skin biopsy and tape preparations were also utilized to examine the dermatitis mechanism.

    Findings:

    • In non-sensitized individuals, dermatitis resulted solely from mechanical irritation by the plant's floral bracts.
    • In sensitized individuals, Russian thistle floral bracts penetrated the skin, triggering an urticarial reaction.

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  • Potassium nitrate, a constituent, did not appear to be the primary cause of the reaction in these tests.

    • Implications:

    • Understanding the dual mechanism of dermatitis (mechanical vs. allergic) is crucial for effective treatment and prevention.
    • This research highlights the importance of identifying plant-specific allergens and irritants.
    • Further research could explore preventative measures or treatments for Russian thistle-induced dermatitis.