Question 1

Which layer of the epidermis is primarily responsible for the production of new keratinocytes?

Accepted Answer

Stratum germinativum (basal layer)

Question 2

What is the primary function of melanocytes in the skin?

Accepted Answer

Absorbing and scattering ultraviolet rays by producing melanin

Question 3

Which cell type in the epidermis acts as an antigen-presenting cell and migrates to lymph nodes to stimulate T-cell proliferation?

Accepted Answer

Langerhans cell

Question 4

Which skin appendage is responsible for producing sebum, and what is its primary function?

Accepted Answer

Sebaceous gland; lubricates skin and prevents moisture loss

Question 5

In psoriasis, which T-helper cell subtype is most implicated in the pathophysiology and keratinocyte proliferation?

Accepted Answer

Th17

Question 6

A patient presents with erythematous, demarcated plaques with silvery scales on the elbows and knees. What is the most likely diagnosis?

Accepted Answer

Plaque psoriasis

Question 7

Which of the following is a common co-morbidity associated with psoriasis?

Accepted Answer

Metabolic syndrome

Question 8

What is the Auspitz phenomenon, commonly seen in psoriasis?

Accepted Answer

Bleeding with mild skin disruption

Question 9

Which cytokine is a key mediator in keratinocyte proliferation in psoriasis?

Accepted Answer

IL-22

Question 10

Which of the following drugs can paradoxically trigger or exacerbate psoriasis?

Accepted Answer

TNF-antagonists

Question 11

In atopic dermatitis, which immune cell and cytokine are most responsible for pruritis?

Accepted Answer

Th2 cells and IL-31/IL-4

Question 12

Which mutation is commonly associated with increased epithelial permeability in atopic dermatitis?

Accepted Answer

Filaggrin mutation

Question 13

A child presents with weeping vesicles, pruritis, and crusting on the cheeks, sparing the nosetip. What is the most likely diagnosis?

Accepted Answer

Atopic dermatitis

Question 14

Which microbe is most commonly associated with microbial dysbiosis in atopic dermatitis?

Accepted Answer

Staphylococcus aureus

Question 15

Which of the following is a key factor that increases sebum production in acne vulgaris?

Accepted Answer

Androgens

Question 16

What distinguishes an open comedone from a closed comedone in acne vulgaris?

Accepted Answer

Open comedones are blackheads due to melanin-containing sebum plugs; closed comedones are whiteheads

Question 17

Which of the following is NOT a precipitating factor for acne vulgaris?

Accepted Answer

Low-protein diet

Question 18

Which of the following best describes the pathophysiology of acne vulgaris?

Accepted Answer

Increased sebum production, keratinocyte proliferation, and Cutibacterium acnes colonization

Question 19

Which topical treatment is most appropriate for mild acne vulgaris targeting abnormal keratinization?

Accepted Answer

Topical retinoids

Question 20

A patient with severe psoriasis and nail dystrophy develops asymmetric distal interphalangeal joint pain. What is the most likely diagnosis?

Accepted Answer

Psoriatic arthritis

Dermatologic Disorders: Anatomy, Physiology, and Pathophysiology

Study Guide - Practice Questions