Dermatology

Question 1

What type of sensitivity reaction is contact dermatitis?

Answer 1

Typer 4 hypersensitivity

Question 2

What is the cause of seborrheic dermatitis?

Answer 2

Pityrosporum ovale

Question 3

What is seborrheic dermatitis

Answer 3

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

Question 4

Auspitz sign

Answer 4

bleeding when scale is scropped (associated with psoriasis)

Question 5

What type of hypersensitivity is hives?

Answer 5

Type 1

Question 6

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

Answer 6

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

Question 7

Stevens Johnsons Syndrome

Answer 7

Epidermal separation involving <10% of body surface area

Question 8

Toxic epidermal necrolysis

Answer 8

Epidermal separation of >30% of BSA

Question 9

Nikolsky’s sign

Answer 9

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

Question 10

What else is on the differential with SJS and TEN?

Answer 10

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

Question 11

Erythema nodosum

Answer 11

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

Question 12

Infections causing erythema nodosum

Answer 12

Streptococcus, coccidioides, yersinia, TB)

Question 13

Inflammatory diseases causing erythema nodosum

Answer 13

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

Question 14

Anatomic location of bullous pemphigoide vs. pemphigus vulgaris

Answer 14

BP: basement membrane
PV: intraepidermal

Question 15

anti-desmoglein

Answer 15

In pemphigus vulgaris

Question 16

Nikolsky’s sign of bullous pemphigoide vs. pemphigus vulgaris

Answer 16

BP: negative
PV: positive

Question 17

Severity of bullous pemphigoide vs. pemphigus vulgaris

Answer 17

BP: milder
PV: possible death

Question 18

Who is molluscum contagiosum common in?

Answer 18

young children and AIDS patients

Question 19

What is the cause of impetigo

Answer 19

GAS and staphylococcal organisms

Question 20

cause of necrotizing fasciitis

Answer 20

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

Question 21

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

Answer 21

beta-hCG, LFTs, cholesterol, and triglycerides

Question 22

Pilonidal cyst

Answer 22

Abscesses in the sacrococcygeal region

Question 23

What is the cause of tinea versicolor?

Answer 23

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

Question 24

Gangrene

Answer 24

Necrosis of body tissue

Question 25

Dry gangrene

Answer 25

Due to insufficient blood flow to tissue

Question 26

Wet gangrene

Answer 26

Involves bacterial infection, usually with skin flora

Question 27

Gas gangrene

Answer 27

C perfringens infection

Question 28

Lichen planus

Answer 28

Planar, purple, pruiritic, persistent, polygonal, penile, perioral, puzzling

Question 29

What virus is associated with pityriasis rosea?

Answer 29

HHV 6 or 7

Question 30

Seborrheic keratosis

Answer 30

NO MALIGNANT POTENTIAL; STUCK ON APPEARANCE

Question 31

Stuck on appearancw

Answer 31

Seborrheic keratosis

Question 32

Actinic keratosis

Answer 32

Precurosr of SCC

Question 33

What skin cancer commonly occurs on the lip?

Answer 33

SCC

Question 34

what is the cause of kaposi’s sarcoma?

Answer 34

HHV-8