← All decks
The first 25 slides, exactly as they appear. The full deck has 144 content slides.
Dermatology
Dermatoses Due to Plants
Built from Dermatology, 5th Edition
What’s inside
12 sections · 144 slides
Overview
- Scope of this topic
- The main categories of plant dermatoses
- Causes of chronic hand and finger dermatitis from plants
- Most common plant dermatoses at a glance
- Most common plant dermatoses (ACD = allergic contact dermatitis, ICD = irritant contact dermatitis)
- Most common plant dermatoses (ACD = allergic contact dermatitis, ICD = irritant contact dermatitis) (continued)
Botanical Aspects
How plants are named, identified, and patch tested
- Why plant names matter
- Poison ivy: same plant, new genus name
- Old and new botanical family names used in this topic
- The basic nomenclatural scheme for plants, using poison ivy as the example
- Identifying an unknown plant
- Patch testing for plant allergy
- Most common relevant botanical allergens and proposed screening tray
- Most common relevant botanical allergens and proposed screening tray (continued)
Immunologic Contact Urticaria
True IgE-mediated allergy to plant proteins
- What immunologic contact urticaria is
- How the reaction happens
- Clinical features
- Oral allergy syndrome
- Protein contact dermatitis
- Treatment
Toxin-Mediated Contact Urticaria
Non-allergic hives that anyone can get from stinging plants
- What toxin-mediated urticaria is
- Stinging nettle (Urtica dioica)
- How the sting works
- Stinging nettle habitat and trichomes
- Clinical course of a nettle sting
- The Dendrocnide trees of Australia
- The most common plants causing toxin-mediated urticaria
- What a biopsy shows
- Office testing methods
- Treatment
Mechanical Irritant Dermatitis
Physical injury from spines, thorns, and hooked hairs
- What mechanical irritant dermatitis is
- Common plants known to cause mechanical irritant reactions
- Common plants known to cause mechanical irritant reactions (continued)
- How cactus glochids cause trouble
- Prickly pears (Opuntia spp.) and their glochids
- Clinical features and infection risk
- Treatment
Chemical Irritant Dermatitis
Direct chemical injury from plant sap and crystals
- What chemical irritant dermatitis is
- Plants most commonly implicated in causing chemical irritant dermatitis
- Plants most commonly implicated in causing chemical irritant dermatitis (continued)
- Calcium oxalate: dumb cane and daffodils
- Calcium oxalate enhances other irritants
- Irritant reaction from garlic
- Spurges: latex-borne irritant chemicals
- Buttercups and chili peppers
- Chili burns
- The century plant (Agave americana)
Phytophotodermatitis
A plant chemical plus sunlight - a burn anyone can get
- What phytophotodermatitis is
- A long history
- Which plant families are most involved
- Recognizing Apiaceae by their flowers
- Apiaceae flower structure and cow parsnip
- Hogweed: a severe cause
- Important members of Apiaceae implicated in phototoxic reactions
- Important members of Apiaceae implicated in phototoxic reactions (continued)
- Rutaceae: the citrus family
- Phototoxic members of the family Rutaceae
- Phototoxic members of the family Rutaceae (continued)
- Other implicated families
- How furocoumarins injure the skin
- From sunlight exposure to lasting dark spots
- Why some celery is riskier
- Clinical timeline of the reaction
- Bullous phase of phytophotodermatitis
- Streaky hyperpigmentation
- Linear hyperpigmented streaks with inflammation
- Phytophotodermatitis from making guacamole
- Risk settings for phytophotodermatitis
- Risk activities for phytophotodermatitis
- Named patterns: strimmer and berlock dermatitis
- Can be mistaken for other conditions
- A key look-alike: allergic, not phototoxic
- Celery workers: a documented outbreak
- Phytophotoallergic contact dermatitis
- Treatment
Allergic Contact Dermatitis - Anacardiaceae
Poison ivy, poison oak, poison sumac, and their relatives
- Anacardiaceae: the leading cause of plant ACD
- House and garden plants that commonly cause dermatoses
- Identifying Toxicodendron plants
- Identifying poison ivy, poison oak, and poison sumac
- The black-spot test
- Poison ivy, oak, and sumac compared
- Most common allergenic Anacardiaceae, plus two cross-reacting families
- Most common allergenic Anacardiaceae, plus two cross-reacting families (continued)
- Geographic range of Toxicodendron species
- Other allergenic Anacardiaceae trees
- Allergic contact dermatitis due to mangos
- Catechols vs resorcinols - a key allergy difference
- The Japanese lacquer tree
- Cross-reactors: ginkgo and Grevillea
- Ginkgo leaves and seeds
- The chemistry of urushiol allergy
- How urushiol reaches the skin
- Timeline and appearance of the rash
- Why the rash seems to 'spread'
- Clinical manifestations of Anacardiaceae dermatitis
- Poison ivy dermatitis: vesicles and bullae
- Poison ivy dermatitis on the trunk
- Erythema multiforme as a complication
- Plants and plant products that can trigger erythema multiforme with severe ACD
- Black-spot poison ivy dermatitis
- Who reacts, and how strongly
- Washing off urushiol
- Treating the rash itself
- Systemic treatment
- Prevention and hyposensitization
Allergic Contact Dermatitis - Asteraceae
The daisy family: chrysanthemums, ragweed, and Parthenium
- Recognizing Asteraceae flowers
- Typical Asteraceae flower heads
- Some of the more than 200 allergenic members of Asteraceae worldwide
- Some of the more than 200 allergenic members of Asteraceae worldwide (continued)
- Some of the more than 200 allergenic members of Asteraceae worldwide (continued)
- Parthenium hysterophorus: a global spread
- Cross-reactors from other families
- Sesquiterpene lactones: the Asteraceae allergen
- Chrysanthemums: the top home-garden cause
- Airborne contact dermatitis (ABCD)
- Airborne contact dermatitis from Parthenium
- Ragweed and Parthenium clinical patterns
- Why Asteraceae allergy raises light sensitivity
- Shared treatment for Anacardiaceae and Asteraceae ACD
Other Plant Families Causing ACD
Garlic, tulips, Peruvian lilies, and tea tree oil
- Alliaceae: garlic and onion
- Tulip fingers
- Peruvian lily dermatitis
- Allergic contact dermatitis in a florist
- Tea tree oil allergy
- Botanical extracts in skin care products
Occupational Plant Dermatoses
Bakers, florists, food handlers, and outdoor workers
- Bakers and food processors
- Florists and horticulturalists
- Food handlers
- Outdoor workers
- Global perspective: plant dermatoses most commonly seen by dermatologists by country (ACD = allergic contact dermatitis, ICD = irritant contact dermatitis, MID = mechanical irritant dermatitis, PPD = phytophotodermatitis, TMU = toxin-mediated urticaria)
- Global perspective: plant dermatoses most commonly seen by dermatologists by country (ACD = allergic contact dermatitis, ICD = irritant contact dermatitis, MID = mechanical irritant dermatitis, PPD = phytophotodermatitis, TMU = toxin-mediated urticaria) (continued)
Dermatoses Erroneously Ascribed to Plants
Reactions caused by fungi, algae, and hitchhiking organisms
- Organisms that are neither plant nor animal
- Lichen dermatitis
- Chlorella and seaweed reactions
- Pseudo-phytodermatitis from hitchhikers
- Key takeaways
- References
- References (continued)
- References (continued)
- References (continued)
- References (continued)
- References (continued)
- References (continued)
- Dermatology, 5th Edition (2-Volume Set)