Dermatologist Certificate Skin Disorders and Diagnosis 3

Question 1

Which mite is responsible for scabies infestation?

Accepted Answer

Sarcoptes scabiei var. hominis

Answer

Demodex folliculorum

Answer

Cheyletiella species

Answer

Dermanyssus gallinae

Question 2

Koebner phenomenon — appearance of lesions along lines of trauma — is classically seen in which condition?

Accepted Answer

Psoriasis

Answer

Atopic dermatitis

Answer

Acne vulgaris

Answer

Seborrheic dermatitis

Question 3

What histological finding is characteristic of mycosis fungoides (cutaneous T-cell lymphoma)?

Accepted Answer

Pautrier microabscesses with atypical lymphocytes in the epidermis

Answer

Granulomas with central caseation

Answer

Subepidermal clefting with eosinophils

Answer

Acanthosis with parakeratosis

Question 4

Livedo reticularis presenting with systemic thrombosis and recurrent pregnancy loss suggests which underlying condition?

Accepted Answer

Antiphospholipid syndrome

Answer

Cryoglobulinemia

Answer

Polyarteritis nodosa

Answer

Livedoid vasculopathy

Question 5

Which skin finding is pathognomonic for Lyme disease?

Accepted Answer

Erythema migrans — expanding annular erythema at tick bite site

Answer

Petechiae and purpura on lower extremities

Answer

Vesiculobullous eruption following dermatome

Answer

Migratory salmon-colored plaques

Question 6

What is the most common benign skin tumor in adults?

Accepted Answer

Seborrheic keratosis

Answer

Dermatofibroma

Answer

Epidermal inclusion cyst

Answer

Lipoma