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(pit'i-ros'pō-rŭm, pit'i-rō-spō'rŭm),
A genus of fungi of disputed pathogenicity found in dandruff and seborrheic dermatitis.
[G. pityron, bran, + sporos, seed]
Farlex Partner Medical Dictionary © Farlex 2012


A genus of fungi with 10 known species of lipophilic organisms of the class Exobasidiomycetes, which do not form mycelia. It is a normal skin saprobe which, in the face of immunocompromise in the host, causes opportunistic infections. Malassezia globosa is the most aggressive, and has been causally linked to dandruff, seborrhoeic dermatitis, and the skin rash of tinea versicolor (pityriasis versicolor).

Malassezia species
• M dermatis.
• M furfur.
• M globosa.
• M nana.
• M obtusa.
• M pachydermatis.
• M restricta.
• M slooffiae.
• M sympodialis.
• M yamatoensis.
M globosa and M restricta are the common causes of clinical disease.
Selenium disulfide, ketoconazole shampoos, ciclopirox olamine, coal tar, zinc pyrithione, miconazole, or tea tree oil.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


A genus of fungi found in dandruff and seborrheic dermatitis.
[G. pityron, bran, + sporos, seed]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Hagdrup, "Splendore-Hoeppli phenomenon in Pityrosporum folliculitis (pseudoactinomycosis of the skin)," Journal of Cutaneous Pathology,vol.
Presence of neutrophilic infiltrate is observed in Pityrosporum folliculitis.
A fungus (yeast) infection with pityrosporum ovale called tinea versicolor, which interferes with skin pigmentation.
Seborrheic dermatitis (SD) is a chronic dermatitis caused by Malassezia yeast species, including Malassezia (Pityrosporum ovale).
Malassezia pachydermatitis (formely Pityrosporum canis) is a monopolar commensal, lipophylic, basi diomycetous yeast in ellipsoidal shape with a thick wall.
(13) Any type of specific bacterial growth is not determined in dacryoliths but fungal colonization (Candida, Pityrosporum spp.
Quantitative variations in distribution of Pityrosporum orbiculare on clinically normal skin.
The most common conditions to consider in the differential diagnosis (Table 1) are angiofibromas, keratosis pilaris, milia, miliaria, flat warts, molluscum contagiosum, pityrosporum folliculitis, and periorificial dermatitis.
Malassezia species are commensal microbiota of the skin of humans and animals but are known to cause disease, such as tinea (pityriasis) versicolor and pityrosporum folliculitis.