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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]


/Pit·y·ros·po·rum/ (pit″ĭ-ros´pĕ-rum) former name for Malassezia.


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.


A genus of fungi found in dandruff and seborrheic dermatitis.
[G. pityron, bran, + sporos, seed]
References in periodicals archive ?
In all 4 cases of Pityrosporum folliculitis, CD4 count was more than 350 indicating that it is an early sign of immunosuppression.
Schlessinger advocates the use of both oral ketoconazole (weekly for six to eight weeks) and a topical foam to treat the underlying pityrosporum infection.
Pityrosporum SR Associated with dacryoliths in obstructive dacryocystitis.
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.
aureus and Pityrosporum ovale, which proliferate during puberty and often are involved in the development of acne (Hamnerius 1996).
Pityrosporum ovale culture from the forehead of healthy children.
In some patients there appears to be an overgrowth of Pityrosporum ovale organisms and the patient may improve with an appropriate antifungal cream or shampoo, particularly ketoconazole.
O desenvolvimento excessivo de um fungo comensal leveduriforme, Pityrosporum (Malassezia) ovale, esta relacionado com a ocorrencia de caspa, uma das alteracoes mais comuns que acometem o couro cabeludo.
3-4) Tea tree oil has been shown to inhibit or kill many detrimental micro-organisms such as Eschericia coli, Mycoplasma pneumoniae, Porphyromonas gingivalis, Propionibacterium acnes, Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus mutans, Streptococcus pyogenes, detrimental fungi on the skin, Candida albicans, Pityrosporum ovale, Trichophyton mentagrophytes, detrimental protozoa, Trichomonas vaginalis, and Herpes Simplex Virus Type 1-2.