Contact Dermatitis Flashcards

1
Q

What is eczema herpeticum?

A

Eczema herpeticum describes a severe primary infection of the skin by herpes simplex virus 1 or 2.

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2
Q

Who is more commonly affected by eczema herpeticum?

A

It is more commonly seen in children with atopic eczema.

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3
Q

What are the typical symptoms of eczema herpeticum?

A

It often presents as a rapidly progressing painful rash.

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4
Q

What are the characteristic lesions seen on examination?

A

Monomorphic punched-out erosions (circular, depressed, ulcerated lesions) usually 1-3 mm in diameter.

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5
Q

Why is eczema herpeticum considered serious?

A

As it is potentially life-threatening, children should be admitted for IV aciclovir.

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6
Q

What percentage of children are affected by eczema?

A

Eczema occurs in around 15-20% of children.

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7
Q

At what age does eczema typically present?

A

Eczema typically presents before 2 years of age.

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8
Q

What percentage of children see eczema clear by 5 years of age?

A

Around 50% of children see eczema clear by 5 years of age.

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9
Q

What percentage of children see eczema clear by 10 years of age?

A

Around 75% of children see eczema clear by 10 years of age.

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10
Q

What are common features of eczema?

A

Eczema features an itchy, erythematous rash and repeated scratching may exacerbate affected areas.

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11
Q

In infants, where is eczema often affected?

A

In infants, the face and trunk are often affected.

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12
Q

In younger children, where does eczema typically occur?

A

In younger children, eczema often occurs on the extensor surfaces.

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13
Q

In older children, where is eczema typically distributed?

A

In older children, a more typical distribution is seen with flexor surfaces affected and the creases of the face and neck.

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14
Q

What is the management strategy for eczema?

A

Management includes avoiding irritants and using simple emollients.

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15
Q

How much emollient should be prescribed?

A

Large quantities should be prescribed, e.g., 250g/week, roughly in a ratio of 10:1 with topical steroids.

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16
Q

How should emollients and topical steroids be applied?

A

Emollients should be applied first, followed by waiting at least 30 minutes before applying the topical steroid.

17
Q

Which form of emollient soaks into the skin faster?

A

Creams soak into the skin faster than ointments.

18
Q

How can emollients become contaminated?

A

Emollients can become contaminated with bacteria; fingers should not be inserted into pots.

19
Q

What is a method used in severe eczema cases?

A

Wet wrapping is a method used, involving large amounts of emollient (and sometimes topical steroids) applied under wet bandages.

20
Q

What medication may be used in severe cases of eczema?

A

In severe cases, oral ciclosporin may be used.

21
Q

What is the recommendation for using topical steroids for eczema?

A

Use the weakest steroid cream which controls the patient’s symptoms.

22
Q

What are the categories of topical steroids by potency?

A

Mild, Moderate, Potent, Very potent.

23
Q

Name a mild topical steroid.

A

Hydrocortisone 0.5-2.5%.

24
Q

Name a moderate topical steroid.

A

Betamethasone valerate 0.025% (Betnovate RD).

25
Q

Name a potent topical steroid.

A

Betamethasone valerate 0.1% (Betnovate).

26
Q

Name a very potent topical steroid.

A

Clobetasol propionate 0.05% (Dermovate).

27
Q

What is the fingertip rule for topical steroids?

A

1 finger tip unit (FTU) = 0.5 g, sufficient to treat a skin area about twice that of the flat of an adult hand.

28
Q

How many fingertip units are needed for the front and back of hands?

A

1.0 FTU.

29
Q

How many fingertip units are needed for an entire leg and foot?

A

8.0 FTU.

30
Q

What is the recommended amount of topical steroids for the face and neck?

A

15 to 30 g.

31
Q

What is the recommended amount of topical steroids for both legs?

A

100 g.