Malassezia (Tinea versicolor and Seborrhoeic dermatitis)


Malassezia (Tinea versicolor and Seborrhoeic dermatitis)


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USMLE® Step 1 questions

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Malassezia (Tinea versicolor and Seborrhoeic dermatitis)

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USMLE® Step 1 style questions USMLE

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A 38-year-old man presents to the office with a 2-month history of itchy, white scales on the scalp. The patient reports that he has had the rash intermittently for many years, but could not recall the precise onset of symptoms. He endorses a greasy scaly rash on the face over the area between the nose and the mouth. Past medical history is noncontributory. Vitals are within normal limits. The physical examination is shown below. Which of the following is the most likely underlying association of this patient’s condition?
Reproduced from Wikimedia Commons

Reproduced from Wikimedia Commons

External References

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Malassezia spp. p. 492, 488

Pityrosporum spp. p. 492


Malassezia species, also known as Pityrosporum are members of human cutaneous commensal flora that are known to cause benign skin conditions, such as tinea versicolor, and seborrheic dermatitis.

Tinea versicolor, commonly caused by Malassezia furfur fungus, affects the skin and causes white or light-colored patches on the body.

In seborrheic dermatitis, fungi flora trigger skin inflammation, which typically affects areas with high sebaceous activity, such as the scalp, face, and trunk. It presents with redness, scaling, and itching.


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