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Dermatology > Dermatitis > Flashcards

Dermatitis Flashcards

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Dermatology Board Prep flashcards
1
Q

What is contact allergic dermatitis

A

A type 4 hypersensitivity reaction caused by contact exposure to an allergen

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2
Q

Presentation of contact allergic dermatitis

A

Onset 24-72hrs in a previously sensitised individual

Sparing of non-exposed areas - often sharp cut off where allergen ends

Itch

Burning

Erythema

Vesicles & bullae

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3
Q

Ix for suspected contact allergic dermatitis

A

Diagnostic - Patch testing

Consider skin biopsy

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4
Q

Histological appearance of contact allergic dermatitis

A

Spongiotic dermatitis

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5
Q

Tx of contact allergic dermatitis

A
  1. Topical Corticosteroids - appropriate for severity

2. Calcineurin inhibitors

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6
Q

Mild TCS

A

Hydrocortisone 0.1%

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7
Q

Moderate TCS

A

Modrasone Clobetasone Butyrate

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8
Q

Potent TCS

A

Betamethasone Valerate

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9
Q

Very potent TCS

A

Clobetasol

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10
Q

Examples of calcineurin inhibitors

A

Tacrolimus topical

Pimecrolimus topical

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11
Q

What is contact irritant dermatitis

A

A non-specific physical irritation rather than a specific allergic reaction

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12
Q

Presentation of contact irritant dermatitis

A

Occurs within mins-hours of a severe irritant

Itch

Burning

Erythema

Vesicles & bullae

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13
Q

Tx of contact irritant dermatitis

A

Same for contact allergic - topical corticosteroid appropriate for severity

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14
Q

Side effects of topical corticosteroids

A

skin thinning
purpura
stretch marks

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15
Q

What is eczema herpeticum

A

Severe primary infection of the skin by herpes simplex virus 1 or 2

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16
Q

Presentation of eczema herpeticum

A

Monomorphic punched out lesions
++ pain
blistering
Buttocks/face

17
Q

Tx of eczema herpeticum

A

Admit to hospital urgently for IV aciclovir - lethal

18
Q

What group of people are most at risk of eczema herpeticum

A

Babies

19
Q

What is seborrhoeic dermatitis /cause

A

a chronic dermatitis caused by an inflammatory reaction related to a proliferation fo a normal skin fungus inhabitant - Malassezia furfur

20
Q

Presentation of seborrhoeic dermatitis

A

eczematous lesions in sebum rich areas - scalp, periorbital, nasolabial folds
+/- otitis media
+/- blepharitis

21
Q

Ix for seborrhoeic dermatitis

A

clinical diagnosis

22
Q

Tx of seborrhoeic dermatitis

A

Scalp -

  1. T-gel
  2. Ketoconazole

Face and body -

  1. Topical antifungal - Ketoconazole
  2. Topical steroids (only for short time)
23
Q

what is pompholyx eczema also known as

A

dyshidriotic dermatitis

24
Q

What is pompholyx eczema

A

chronic relapsing-remitting vesicular eruption on the palms and soles of the feet

25
Q

Tx pompholyx eczema

A

Topical corticosteroids

Oral corticosteroids

26
Q

Ix for pompholyx eczema

A

clinical diagnosis

Dermatology (20 decks)

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