Derma - Papulosquamous Disorders Flashcards Preview

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Flashcards in Derma - Papulosquamous Disorders Deck (31)
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1
Q

Papulosquamous disorders

A

Psoriasis
Lichen planus
Pityriasis rosea

2
Q

A chronic inflammatory papulo-squamous disease of unknown etiology characterized by sharply demarcated, dull red scaly papules and plaques, particularly on the extensor prominences and in the scalp.

A

Psoriasis

3
Q

Prevalence of psoriasis

A

1-3 % of population

4
Q

Population affected by psoriasis

A

Men = women
Siblings and offspring - inc risk
Early onset - less stable, more severe

5
Q

Age of onset peaks at these ages

Psoriasis

A

20s

50s

6
Q

Once expressed, it is likely to follow a relentless, waxing, and waning course

A

Psoriasis

7
Q

How many % of ptx with psoriasis have nail involvement

A

1/3

8
Q

How many % of ptx have psoriatic arthritis

A

5-8%

9
Q

Clinical types of psoriasis

A
Plaque psoriasis
Guttate
Psoriasis
Localized pustular psoriasis
Inverse or intertriginous psoriasis
Generalized pustular psoriasis
Erythrodermic psoriasis
10
Q

Nail findings of psoriasis (w/ nail involvement)

A
Pitting
Oncholysis
Subungual thickening
Oil drop sign
Nail dystrophy
11
Q

Most common form of psoriatic arthritis

A

Asymmetric oligoarticular (70%)

12
Q

A translucent yellow-red discoloration int he nail bed proximal to onycholysis

A

Oil drop or salmon patch

13
Q

Sign of partial loss of cells from the surface of the proximal nail matrix

A

Pitting

14
Q

Rheumatoid factor result of psoriatic arthritis

A

Negative

15
Q

Tx of psoriasis

A

Topical therapy (topical steroids, tar, anthralin, vit. A analogue - tazarotene)
Phototherapy - PUVA, Selective UVB therapy (Narrowband UVB)
Systemic therapy - methotrexate, cyclosporine, retinoids

16
Q

Acute or chronic inflammation of mucous membranes or skin characterized by violaceous, shiny, pruritic papules topped with fine white lines (wickham’s striae)

A

Lichen planus

17
Q

Sites of lichen planus

A
Flexor surface of wrists
Lumbar region
Shins
Eyelids
Scalp
Buccal mucosa
Tongue
Lips
Nails
18
Q

Scalp lesions of lichen planus are associated with

A

Alopecia

19
Q

Mnemonic 6P’s of lichen planus

A
Pruritic
Purple
Polygonal
Peripheral
Papules
Penis
20
Q

Precipitating factor of lichen planus

A

Severe emotional stress

21
Q

Lichen planus associated with this infection

A

Hep C

22
Q

Tx lichen planus

A

Topical or intralesional corticosteroids
Short courses of oral prednisone (rarely)
PUVA for generalized or resistance cases
Oral retinoids for erosive lichen planus in the mouth

23
Q

Acute self-limiting erythematous eruption characterized by red, oval patches, and papules with marginal collarette of scales

A

Pityriasis rosea

24
Q

Sites affected by pityriasis rosea

A

Trunk

Proximal aspect of arms and legs

25
Q

Etiology of pityriasis rosea

A

Viral (probably)

26
Q

Christmas tree pattern

A

Pityriasis rosea

27
Q

Long axis of lesions follow lines of cleavage producing Christmas tree pattern on the back

A

Pityriasis rosea

28
Q

Pityriasis rosea starts with a

A

Herald patch

29
Q

How long does it take for other lesions to precede the herald patch in pityriasis rosea

A

1-2 weeks

30
Q

When does pityriasis clear up

A

6-12 weeks

31
Q

Tx pityriasis rosea

A

No tx needed unless itchy or widespread