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Plant dermatitis

Authors: Created 1997. Updated: Hana Numan, Medical Writer, New Zealand. Copy edited by Gus Mitchell. October 2021


What is plantdermatitis?

Plant dermatitis is aninflammationof the skin caused bytopicalcontact with a plant or plantconstituent.

Phytodermatitis is the formal medical name for plant dermatitis, and it may be anirritantcontact dermatitis,allergic contact dermatitis, orphytophotodermatitis.

Contacturticariaand mechanical irritation can also be due to plants.

Common plants that cause dermatitis

Who gets plant dermatitis?

Plant dermatitis can affect anyone in contact with the specific plant component including the sap, bark, wood, leaf, stem, flower, pollen, or fruit. Exposure may be:

What causes plant dermatitis?

  • Chemical or mechanical irritant
    • Skin injury damaging the skin barrier
    • Can affect anyone with sufficient exposure
    • Chemical irritant such asseaweedtoxins
    • Mechanical irritant eg,Bindii dermatitis
  • Contactallergen
    • Delayed (type 4)hypersensitivityreaction
    • Only affects someone with an immune-mediated allergy to it
    • Examples includeprimula,poison ivy,grevillea
  • Phytophototoxicity
    • Plant-derived phototoxin
    • Skin reaction following contact is induced by UVA in sunlight
  • Contact urticaria
    • Non-immunological, for example formic acid in stinging nettles
    • Immunologicaleg,latex, the sap from rubber trees

What are the clinical features of plant dermatitis?

  • Asymmetrical
  • Patterned such aslinearor spattered
  • Erythema, blistering,scaling, or cracks
  • Distributionrelative to contact site:
  • Onset
    • Rapid ifacuteirritant,辐透otoxic, or contact urticaria
    • Delayed whilesensitisationdevelops in allergic contact, then rapid on subsequent exposure
  • Symptoms
    • Burning pain with irritant or phototoxic reactions
    • Itchy if allergic contact
    • Contact urticaria may cause burning, tingling, or itch

Plant dermatitis

临床特征如何不同在不同类型啊f skin?

What are the complications of plant dermatitis?

How is plant dermatitis diagnosed?

Plant dermatitis should be suspected clinically on history and examination. Tests may be undertaken to clarify or confirm the diagnosis.

What is thedifferential diagnosisfor plant dermatitis?

What is the treatment for plant dermatitis?

General measures

  • Minimise contact with the relevant plant
    • Protective clothing
    • Remove the implicated plant from the garden
  • Sun protection
  • Avoid aggravating the problem with potentially irritating orallergenictopical applications
  • Cool compress

Specific measures

  • Topicalororalcorticosteroidsfor the acuteinflammatoryphase
  • Chronic plant dermatitis may require systemic immunosuppressant medication

What is the outcome for plant dermatitis?

Plant dermatitis is usuallyself-limitingprovided further contact with the implicated plant is avoided, although postinflammatory hyperpigmentation maypersistfor weeks or months. A true plant allergy persists lifelong.

Some forms of contact are unavoidable such as in airborne compositae allergy and a chronic辐透osensitivedermatitis may follow.


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