Other types of atopic dermatitis Flashcards

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1
Q

types of atopic dermatitis

A

Atopic dermatitis (eczema)

Nummular (discoid) eczema

Pityriasis alba

Lichen simplex chronicus

Dyshydrotic dermatitis (pompholyx)

Asteatotic dermatitis (‘winter itch’)

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2
Q

Nummular (discoid) eczema

A

Chronic, red, coin-shaped plaques

Crusted, scaling and itchy

Mainly on the legs, also buttocks and trunk

Treatment as for classic atopic dermatitis

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3
Q

Pityriasis alba

A

These are white patches on the face of children and adolescents.

Can occur on the neck and upper limbs, occasionally on trunk.

Full repigmentation occurs eventually.

Treatment

  • Reassurance
  • Simple emollients
  • Restrict use of soap and washing
  • May prescribe hydrocortisone ointment (rarely necessary)
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4
Q

Lichen simplex chronicus

A

Circumscribed thick plaques of lichenification

Caused by repeated rubbing and scratching of previously normal skin

Due to chronic itch of unknown cause

Treatment

  • Explanation
  • Refrain from scratching
  • Potent topical corticosteroid ointment (with or without occlusion) to break the itch–scratch cycle
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5
Q

Dyshydrotic dermatitis (pompholyx)

A

Itching vesicles on fingers

May be larger vesicles on palms and soles

Commonly affects sides of digits and palms

Often triggered by high humidity

Treatment

  • Wet dressings/soaks if severe
  • As for atopic dermatitis, although use a cream for exudative phase, then ointment as the skin dries
  • Potent fluorinated corticosteroids topically use under occlusion (e.g. damp cotton glove)
  • Oral corticosteroids for 3 weeks may be necessary
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6
Q

Asteatotic dermatitis (‘winter itch’)

A

It is a form of eczema that occurs in the elderly subjected to considerable scrubbing and bathing.

  • common
  • often unrecognised
  • very itchy dermatitis
  • with a dry ‘crazy paving’ pattern, esp. on the legs.

Other predisposing factors include:

  • low humidity (winter, central heating)
  • diuretics.

Treatment

  • Avoid scrubbing with soaps
  • Use aqueous cream and a soap substitute
  • Apply topical steroid diluted in white soft paraffin
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