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Dermatophyte Infections and Fungal Dermatology Quiz

Dermatophyte Infections And Fungal Dermatology Quiz

Explore the fascinating world of fungi with this focused assessment. Dive deep into mycological studies, examining key aspects of fungal biology and ecology. Perfect for learners aiming to enhance their understanding of...

Questions: 27 | Attempts: 10 | Last updated: Aug 4, 2025

Sample Question 1
What is the mechanism of hypopigmentation and how would you treat a patient with hypopigmented macules on their back and under skin folds after working out every day in the summer?

Increase sun exposure

Prescribe topical corticosteroids

*Change shampoo, with Selenium Sulfide and/or ORAL antifungals.*Patient most likely has Tinea(pytririasis) VersicolorMalassezia spp.(PITYROSPORUM.spp), don't think that it is a dermatophyte just because it is called Tinea, Malassezia spp. is YEAST LIKE FUNGUS.*Hypopigmented/Pink patches are due to ability of malassezia to damage melanocytes by acids produced trough degradation of lipids.*This Fungus(Not a dermatophyte) loves humid environment and is more common in summer(+becomes apparent with tanning)*Classic KOH appearance on Microscopy would show short curved septate hyphae and yeast clusters .(Referred to as SPHAGETTI and MEATBALLS)*Also it has Coppery/orange fluorescence on wood lamp test(Not super HY,but is in golijan and kaplan)

Apply moisturizing lotion

Sample Question 2
Which of the following would help you to narrow down your differential diagnosis for a patient with lymphadenopathy + alopecia with scaling?

The symptoms could be indicative of syphilis, a sexually transmitted infection that can cause skin rashes, fever, and fatigue.

It could be psoriasis, a chronic autoimmune condition that causes raised, red, scaly patches on the skin.

The patient might have seborrheic dermatitis, a common skin condition that causes red, flaky, greasy skin that may itch slightly.

*Patient most likely has Tinea Capitis(Yes it can cause Lymphadenopathy),remember that characteristic findings of Superficial Dermatophytes(Microsporum,Trichophyton,Epidermopyton) on KOH preparations with blue fungal stains is Branching septate hyphae on KOH.*Remember they are fungi, so if they ask you which culture medium you would choose for growth choose Sabouraud Dextrose agar(Low Ph, and antibiotics like chloramphenicol kill off bacteria and let fungi grow_

Sample Question 3
Guy has multiple erythematous scaling rings with central clearing over his torso, which superficial dermatophyte is causing it and why it is not Tinea Cruris?

Tinea Versicolor: This is a fungal infection caused by Malassezia furfur, presenting with hypopigmented or hyperpigmented macules on the trunk and shoulders.

Tinea Pedis: This is a fungal infection of the feet, commonly known as athlete's foot, presenting with redness, scaling, and itching between the toes.

*Remember tOrsO for Tinea cOrpOris,more important clue was characteristic ringworm appearance*Tinea cruris does NOT show this central clearing and is more likely to involve Inguinal area.

Tinea Capitis: This is a fungal infection of the scalp, not torso, and presents with scaling, itching, and alopecia.

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