Malassezia Folliculitis vs Acne Vulgaris: Key Diagnostic and Treatment Differences

Zoe Diana Draelos, MD, a research and clinical dermatologist at Dermatology Consulting Services in High Point, North Carolina, outlined the diagnostic distinctions between Malassezia folliculitis and acne vulgaris in a recent Dermatology Times interview. Draelos was a co-author on a recent paper published in the Journal of Drugs in Dermatology exploring the presentation, diagnosis, and treatment of Malassezia folliculitis.¹ She explained how the 2 conditions differ in morphology, distribution, and causative organism, and why each requires a fundamentally different treatment approach.

Clinical Features That Separate the 2 Conditions

To the untrained eye, Malassezia folliculitis and acne look nearly identical, Draelos noted. A dermatologist, however, can distinguish them based on lesion pattern. Malassezia folliculitis presents with a monomorphous distribution of pustules, whereas acne produces a mix of open comedones, closed comedones, inflammatory lesions, nodules, cysts, and pustules.

"Acne is a mixture of cysts, open comedones, closed comedones, inflammatory lesion, and pustules, and they're not monomorphous," Draelos said. "They are monomorphous in Malassezia folliculitis."

The absence of comedones and cysts in Malassezia folliculitis is a reliable differentiating marker. Acne also presents with nodules and cysts not seen in fungal folliculitis, and its pustules are more polymorphous in appearance.

Distribution and Associated Conditions

Location offers another diagnostic clue. Malassezia folliculitis commonly appears along the hairline, given the fungus's high concentration in the scalp. Draelos noted Malassezia is also a known cause of seborrheic dermatitis—referred to in consumer terminology as dandruff—and the 2 conditions can coexist in the same patient.

Organism Differences Drive Treatment Selection

The causative organisms are distinct. Acne is caused by C. acnes, a bacterium, while Malassezia folliculitis is caused by Malassezia, a fungus previously known as pityrosporum. Treating fungal folliculitis with antibacterial antibiotics will not produce a response, and the reverse is equally true.

"When you're treating acne, you're going to use antibacterial antibiotics, but when you're treating fungal folliculitis, you're going to be using antifungals topically or orally," Draelos said.

When to Add Antifungal Therapy

Draelos set a low threshold for considering antifungals when the clinical picture is unclear. Malassezia folliculitis is susceptible to clotrimazole and other established topical agents, making an empiric trial straightforward. Persistent pustular involvement without antibiotic response should prompt reconsideration of the diagnosis.

"If you have very monomorphous acne not getting better on antibiotics, you really should consider Malassezia folliculitis in a differential diagnosis," Draelos said. "If acne isn't going away, it's not responding, there's still a lot of pustular involvement, consider Malassezia folliculitis as a treatment option."

Reference

1. Draelos ZD, Barbieri JS, Tanghetti EA, et al. Malassezia folliculitis presentation, diagnosis, and treatment: a review of "fungal acne". J Drugs Dermatol. 2026;25(5):427-434. doi:10.36849/JDD.9751