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Terms in this set (35)
What is contact dermatitis
Eczematous dermatitis caused by exposure to environmental substances
How many exposures does it take for an irritant to cause contact dermatitis?
Few to many
What are the nature of the borders in irritant contact dermatitis?
They are indistinct
How long does it take dermatitis to clear?
Within 2-3 week break
How long does it take for dermatitis to return
within days of return of exposure
What can a weekend tell you about allergic vs. irritant
Slight improvement over weekend is unlikely with allergens, may occur with weak irritant reactions
What type of lesions are associated with acute toxic exposure?
what type of physical response is associated with a cumulative response?
What do detergents and solvents cause
A gradual irritant contact dermatitis
-Dry, fissured, thickened skin
Who is likely to get irritant contact dermatitis, and where are they most likely to get it?
Frequent hand washers
What do chromates cause
-Corrosive necrotizing effects
What are people with atopic dermatitis more likely to contract?
MRSA and veruca
What body surface is likely to avoid involvement from allergic contact dermatitis?
How does systemic allergic contact dermatitis work?
After topical sensitization to an allegen, oral ingestion of the allergen causes diffuse reaction
What mediates allergic contact dermatitis?
what substances have the same oil as poison ivy?
mangos and cashews
What causes compositae dermatitis
Exposure to a parthenolide
-Tansy, feverfew, pyrethrum
What causes ACD alstroemeria
Tuliposide A (most concentrated in the bulb)
What are common allergenic fragrances?
Balsum of peru
How do you test whether nickel plated objects will produce dermatitis?
What is tricky about nickel sensitivity?
nickel can penetrate rubber gloves
What causes ACD quaterium
-Common topical preservative that cross reacts with formaldehyde
How do you get textile dermatitis from formaldehyde?
-Permanent press, wrinkle free
Where can you be exposed to propylene glycol
cosmetics, pharmaceuticals, topical steroids
Where can you be exposed to oxybenzone?
most common sunscreening agent in US
What is important to remember with bacitracin sensitivities
cross reaction with neomycin
What is thiuram
A rubber glove component
-gloves may exacerbate existing hand dermatitis
where can you get mercaptobenzothiazole exposure?
MBT is a rubber accelerator
-an agent to speed up rubber vulcanization
-common cause of ACD from shoes
How can bleached underwear cause an allergic reaction?
-Bleach induces change in Zinc Debenzyldithiocarbamate (ZDC)
-Negative screening to rubber allergens
What is the effect of topical steroids on a sorbic acid reaction?
No improvement or worse course
what allergens cause urticaria?
Acids (benzoic, sorbic, cinnaminic)
How do you test for an allergic reaction
Provocation use/open test
-Apply substance to antecubital fossa twice daily for one week
when is patch testing indicated?
If the dermatitis is:
-Deterrent to work/life activities
when should patch testing be avoided?
Avoid testing with acute dermatitis
what is the prep for irritant test reactions?
Do not prepare test sites with solvents or soaps
THIS SET IS OFTEN IN FOLDERS WITH...
CM-Bacterial Infections of the Skin
CM- Fungal/Viral Skin Infections
CM- Cutaneous Manifestations of Systemic Diseases
CM- Acne and Warts
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