Fungal Skin Infections MCQ Quiz | Infective Dermatoses

Welcome to this comprehensive quiz on Fungal Skin Infections, a key topic within Infective Dermatoses for MBBS students. This quiz is designed to test your knowledge on the diagnosis, clinical presentation, and management of common and important mycoses affecting the skin. You will encounter 25 multiple-choice questions covering dermatophytes, yeasts, and subcutaneous fungal infections. After attempting all the questions, click the “Submit” button to see your score and review your answers, with correct and incorrect choices clearly highlighted. For your future revision, you can also download a PDF document containing all the questions along with their correct answers by clicking the “Download Answers (PDF)” button. Good luck!

1. A 10% potassium hydroxide (KOH) mount of skin scrapings from a patient with Tinea corporis will most likely reveal:

2. The causative organism for Pityriasis (Tinea) versicolor is:

3. A Wood’s lamp examination of a scalp lesion caused by Microsporum canis would typically show which color fluorescence?

4. A patient presents with an intensely inflammatory, boggy, and tender mass on the scalp with pustules and hair loss. This clinical presentation is known as:

5. Which of the following systemic antifungal agents is the drug of choice for treating onychomycosis due to its high efficacy and fungicidal action?

6. The “id reaction” or dermatophytid is a sterile vesicular rash that occurs distant to the primary fungal infection site. It is best described as a:

7. Which of the following organisms is NOT classified as a dermatophyte?

8. A male patient presents with a pruritic, erythematous rash in his groin. On examination, the scrotum is notably spared. This feature is characteristic of:

9. Azole antifungals (e.g., fluconazole, clotrimazole) exert their effect by inhibiting which enzyme?

10. “Rose gardener’s disease,” characterized by nodular and ulcerative lesions along lymphatic channels, is caused by:

11. Griseofulvin is a fungistatic agent that is only effective against dermatophytes. What is its mechanism of action?

12. Tinea nigra, a superficial mycosis presenting as a brown or black non-scaly macule on the palms or soles, is caused by:

13. A diabetic patient presents with beefy red erythema in the axilla with satellite pustules and papules. The most likely diagnosis is:

14. The “black dot” appearance in tinea capitis is due to:

15. Majocchi’s granuloma is a deep, suppurative form of tinea that involves the:

16. The hypopigmentation seen in Pityriasis versicolor is caused by the fungal production of:

17. Favus, a chronic, severe form of tinea capitis characterized by scutula (yellow, cup-shaped crusts), is classically caused by:

18. What is the primary cellular target of polyene antifungals like Amphotericin B?

19. A patient complains of itching, scaling, and maceration between the fourth and fifth toes. This clinical picture is most consistent with:

20. The “one hand, two feet” syndrome is a classic presentation of dermatophytosis, most commonly caused by:

21. Which diagnostic method is considered the gold standard for identifying the specific species of a dermatophyte?

22. In addition to systemic antifungal therapy, the management of a severe kerion may include a short course of oral corticosteroids to:

23. Allylamines, such as terbinafine, work by inhibiting which fungal enzyme?

24. Which of the following describes the most common type of hair shaft invasion by a dermatophyte, known as ectothrix?

25. First-line therapy for localized, uncomplicated Tinea corporis is typically: