Dermatology Flashcards

1
Q

What type of sensitivity reaction is contact dermatitis?

A

Typer 4 hypersensitivity

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2
Q

What is the cause of seborrheic dermatitis?

A

Pityrosporum ovale

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3
Q

What is seborrheic dermatitis

A

Infants: severe, red diaper rash or thick crust on scalp

Children/adults: red, scaly patches seen around the eyes, ears, nasolabial fold, mid chest, and scalp

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4
Q

Auspitz sign

A

bleeding when scale is scropped (associated with psoriasis)

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5
Q

What type of hypersensitivity is hives?

A

Type 1

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6
Q

When do drug eruptions usually occur? (i.e how many days after taking the drug?)

A

7-14 days (so if a patient reacts wtihin 1-2 days, it is probably not the drug causing it!

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7
Q

Stevens Johnsons Syndrome

A

Epidermal separation involving <10% of body surface area

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8
Q

Toxic epidermal necrolysis

A

Epidermal separation of >30% of BSA

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9
Q

Nikolsky’s sign

A

Separation of superficial skin layers with slight rubbing (think about SJS and TEN!)

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10
Q

What else is on the differential with SJS and TEN?

A

SSSS (which is usually seen in kids < 6yo and has infectious etiology

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11
Q

Erythema nodosum

A

Painful, erythematous nodules on the lower legs and slowly spread. Fom infection, drugs, inflammatory disease

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12
Q

Infections causing erythema nodosum

A

Streptococcus, coccidioides, yersinia, TB)

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13
Q

Inflammatory diseases causing erythema nodosum

A

sarcoidosis, Crohn’s disease, UC, Behcet’s disease

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14
Q

Anatomic location of bullous pemphigoide vs. pemphigus vulgaris

A

BP: basement membrane
PV: intraepidermal

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15
Q

anti-desmoglein

A

In pemphigus vulgaris

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16
Q

Nikolsky’s sign of bullous pemphigoide vs. pemphigus vulgaris

A

BP: negative
PV: positive

17
Q

Severity of bullous pemphigoide vs. pemphigus vulgaris

A

BP: milder
PV: possible death

18
Q

Who is molluscum contagiosum common in?

A

young children and AIDS patients

19
Q

What is the cause of impetigo

A

GAS and staphylococcal organisms

20
Q

cause of necrotizing fasciitis

A

s. pyogenes or mixed infection (s. aureus, e.coli, clostridium perfringens)

21
Q

What tests must be done monthly for a patient on accutane?

A

beta-hCG, LFTs, cholesterol, and triglycerides

22
Q

Pilonidal cyst

A

Abscesses in the sacrococcygeal region

23
Q

What is the cause of tinea versicolor?

A

Malassezia furfur!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

24
Q

Gangrene

A

Necrosis of body tissue

25
Dry gangrene
Due to insufficient blood flow to tissue
26
Wet gangrene
Involves bacterial infection, usually with skin flora
27
Gas gangrene
C perfringens infection
28
Lichen planus
Planar, purple, pruiritic, persistent, polygonal, penile, perioral, puzzling
29
What virus is associated with pityriasis rosea?
HHV 6 or 7
30
Seborrheic keratosis
NO MALIGNANT POTENTIAL; STUCK ON APPEARANCE
31
Stuck on appearancw
Seborrheic keratosis
32
Actinic keratosis
Precurosr of SCC
33
What skin cancer commonly occurs on the lip?
SCC
34
what is the cause of kaposi's sarcoma?
HHV-8