Which clinical history findings are characteristic of Malassezia (Pityrosporum) folliculitis?

Updated: Apr 03, 2020
  • Author: Sarah Sweeney Pinney, MD, FAAD; Chief Editor: William D James, MD  more...
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The Pityrosporum folliculitis patient's history is that of a chronic, often pruritic, papular and pustular eruption with perifollicular erythema most commonly on the back, upper arms, and chest.

The main differential diagnoses of Pityrosporum folliculitis are acne vulgaris and staphylococcal folliculitis. Often, patients have been treated with antibiotics or another medication appropriate for acne vulgaris, resulting in no improvement or worsening of their condition. [22] Recalcitrant acne should be reevaluated for potential Pityrosporum infection. [23]

A history of hospitalization may also play a role in initial colonization. [24]

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