Lecture 3 - derm

Question 1

Location: 
Stasis dermatitis 
Seborrheic dermatitis 
Atopic dermatitis 
Psoriasis

Answer 1

Stasis dermatitis - lower legs
Seborrheic dermatitis - scalp
Atopic dermatitis - flexor surfaces
Psoriasis - extensor surfaces

Question 2

Etiology 
Stasis dermatitis 
Seborrheic dermatitis 
Atopic dermatitis 
Irritant dermatitis 
Allergic contact dermatitis

Answer 2

Stasis dermatitis - lower extremity edema
Seborrheic dermatitis - malassezia furfur
Atopic dermatitis - filaggrin
Irritant dermatitis - common irritant
Allergic contact dermatitis - common allergens

Question 3

Misc facts
Atopic dermatitis
Allergic contact dermatitis
Psoriasis

Answer 3

Atopic dermatitis - associated with asthma and allergic rhinitis
Allergic contact dermatitis - delayed type hypersensitivity IV, confirmed with patch testing
Psoriasis - may be associated with increased risk of cardiovascular disease

Question 4

common skin diseases associated with:

infants (birth-2 years)

Answer 4

□ Generalized eruption:

erythematous papules, redness, scaling and areas of lichenification

Question 5

common skin diseases associated with:

Answer 5

□ Involvement of flexural skin 
® Antecubital fossa 
® Popliteal fossa 
® Neck 
® Wrists 
® Ankles

Question 6

common skin diseases associated with:

Adult (>12 years)

Answer 6

□ Dry Skin (Xerosis)
□ Keratosis Pilaris
□ Ichthyosis vulgaris
□ Hyperlinearity of the palms

Question 7

Location: 
Stasis dermatitis 
Seborrheic dermatitis 
Atopic dermatitis 
Psoriasis

Answer 7

Stasis dermatitis - lower legs
Seborrheic dermatitis - scalp
Atopic dermatitis - flexor surfaces
Psoriasis - extensor surfaces

Question 8

Atopic dermatitis diagnostic criteria

Q

Answer 8

Must have: Itchy skin +Plus

• Three or more of the following:
o History of involvement of skin creases (or face if pt < 10 yrs)
o Personal history of asthma or hay fever (or FH of atopic disease if pt < 4 yrs)
o History of dry skin within the last year
o Visible flexural eczema (or face if pt < 4 yrs)
o Onset under 2 years of age

Question 9

Most common type of contact dermatitis

Answer 9

Irritant Contact Dermatitis

Question 10

Non-immunologically mediated rash
vs
Complex immune mediated rash

Answer 10

Non-immunologically mediated rash
- Irritant Contact Dermatitis

Complex immune mediated rash (type IV)

• Allergic Contact Dermatitis
• Drug eruptions

Question 11

cellulitis vs allergic dermatitis

Answer 11

○ Cellulitis

• More painful/tender
• More In the dermis and subcu
• warm
• both sides can be affected, but more so unilateral involvement

○ Allergic dermatitis
§ More itchy
§ More epidermis

Question 12

“psoriasis vulgaris” affects what % of pop? what triggers it?

Answer 12

Q

- Affects 2% of the population (takes genetic disposition + environmental trigger)

Question 13

5 main types of psoriasis:

Answer 13

1. Plaque
2. Gutatte
3. Inverse (think intertriginous)
4. Pustular
5. Erythrodermic

Question 14

Are nail changes associated with atopic dermatitis? Psoriasis?

Answer 14

No for atopic

yes for psoriasis

Question 15

Auspitz sign

Answer 15

pinpoint bleeding upon scraping

- sign of psoriasis

Question 16

Exanthemous drug eruptions

Answer 16

aka maculopapular eruptions aka morbilliform eruptions aka drug rashes
- Most common type of drug reaction in skin
- Usually cell-mediated type IV hypersensitivity (just like contact dermatitis)
- Drug Eruptions differential dx = Viral Exanthem
(Viral infections enhance the risk of drug eruption)

Question 17

Urticaria

Answer 17

Hives)

Immediate type I hypersensitivity reaction mediated by IgE antibodies

Question 18

most common complication seen with chickenpox.

Answer 18

Secondary infection or cellulitis