Dermatology MCQ 3 Questions With Answers And Detailed Explanations

Dermatology MCQs 3 Questions With Answers And Detailed Explanations

Which one of the following is most important in the development of melanoma?

A. Trauma to a compound nevus

B. Chronic sun exposure ✅

C. Chemical exposure

D. Working in coal mines

E. Cigarette smoking

Question Explanation:

Chronic sun exposure is the major cause of melanoma. Cigarette smoking, exposure to coal dust, chemical exposure, or trauma to a compound nevus has not been associated with the development of melanoma.

A 19 year old girl has onset of pruritic rash characterized by excoriations, scaling and crusting that is distributed on the extremities, neck and eyelids. History of asthma and hay fever is present in past. Which of the following is the most likely diagnosis?

A. Dyshydrotic eczema

B. Atopic dermatitis ✅

C. Shingles

D. Contact dermatitis

E. Scabies

Question Explanation:

Dermatitis is an inflammation of the skin that may cause dryness, flaking, and itching. Atopic means this type of dermatitis is related to or caused by a hereditary predisposition toward certain hypersensitivity reactions, such as asthma or hay fever, when exposed to specific triggers called antigens.

Atopic dermatitis can occur in both children and adults, and sometimes first appears during infancy. Atopic dermatitis often affects people with a family history of allergies. Atopic dermatitis is linked with asthma and hayfever. These conditions often run together in a family.

Atopic dermatitis leads to itching and redness, and may make the skin dry and flaky. Sometimes itchy blisters form. The surface of the skin may become moist and crusty if these blisters burst, or when scratching damages the skin. Atopic, dermatitis is often worse in the folds of the skin where the limbs bend. The itch is intense, but scratching only makes the symptoms worse.

A soldier develops a papule on his forearm about a month after returning from the Middle East. Papule subsequently ulcerates to form a shallow annular lesion with a raised margin. The lesion shows no signs of healing 3 months after it first appeared. He has no systemic symptoms. The most likely diagnosis is

A. Malaria

B. Schistosomiasis

C. Leishmaniasis ✅

D. Trypanosomiass

E. Syphilis

Question Explanation:

The indolent course of the sore described favors the diagnosis of cutaneous leishmaniasis. Neither malaria nor schistosomiasis produces such sores. The chancres of syphilis and trypanosomniasis are more fleeting in duration.

A teenage girl comes with complaint of ache on her face. Physical exam show open and closed comedones with two papules on her chin. You diagnose her with mild acne on her face. The most appropriate initial treatment is which one of the following?

A. Oral accutance.

B. Oral minocyline

C. Oral clindamycin

D. Topical benzoyl peroxide ✅

E. Topical fusidic acid

Question Explanation:

Mild inflammatory acne should be treated with topical benzoyl peroxide and/or topical antibiotics (eg, erythromycin, clindamycin). Moderate acne responds best to oral systemic-therapy with antibiotics. Antibiotics effective for acne include tetracycline, minocycline, erythromycin, and doxycycline. Severe acne: Oral isotretinoin (accutane) is the best treatment for patient with moderate acne in whom antibiotics are unsuccessful and for those with severe inflammatory acne.

A 36-year-old man has a 4-week history of a generalized, intensely pruritic rash. He is otherwise well. His 11-year-old son also develops itching. On examination, there is a generalized rash consisting of excoriated papules and vesicles on wrists, sides of fingers, arms and buttocks. No other abnormalities are present. The most likely diagnosis i

A. Scabies ✅

B. Pityriasis rosea

C. Neurodermatitis

D. Impetigo (pyoderma)

E. Urticaria

Question Explanation:

Scabies is an infestation of the skin with the mite Sarcoptes scabiei. Scabies causes intensely pruritic lesions with erythematous papules and burrows in web spaces, wrists, waistline and genitals. Diagnosis based on examination and scrapings. Treatment is with topical scabicides such as permethrin.

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