ABD Inflammatory Dermatoses 5

Question 1

Allergic contact dermatitis is mediated by which immunologic mechanism?

Accepted Answer

Type IV delayed-type hypersensitivity

Answer

Type I IgE-mediated

Answer

Type II cytotoxic

Answer

Type III immune complex

Question 2

A linear vesicular eruption on an exposed forearm after a hike is most characteristic of contact dermatitis from what?

Accepted Answer

Urushiol (poison ivy/oak)

Answer

Nickel jewelry

Answer

Latex gloves

Answer

Fragrance in lotion

Question 3

The gold-standard test to identify the causative allergen in allergic contact dermatitis is what?

Accepted Answer

Patch testing

Answer

Prick testing

Answer

Serum IgE (RAST)

Answer

Skin biopsy

Question 4

The most common metal allergen causing allergic contact dermatitis, often from earrings and belt buckles, is what?

Accepted Answer

Nickel

Answer

Gold

Answer

Titanium

Answer

Platinum

Question 5

How does irritant contact dermatitis differ immunologically from allergic contact dermatitis?

Accepted Answer

It is non-immunologic direct cytotoxic injury

Answer

It is IgE-mediated

Answer

It requires prior sensitization

Answer

It is antibody-mediated

Question 6

Nummular dermatitis is best described by which morphology?

Accepted Answer

Coin-shaped eczematous plaques

Answer

Annular scaly rings with central clearing

Answer

Linear burrows

Answer

Umbilicated papules

Question 7

Stasis dermatitis, an inflammatory dermatosis of the lower legs, results from what underlying process?

Accepted Answer

Chronic venous insufficiency

Answer

Arterial embolism

Answer

Fungal infection

Answer

Autoimmune blistering