​Infectious Diseases and Microbiology - Pityriasis versicolor ( Malassezia furfur)

​Infectious Diseases and Microbiology - Pityriasis versicolor ( Malassezia furfur) 
Pityriasis versicolor is a skin condition that is caused by a type of yeast called Malassezia furfur, which has an affinity for lipids. Malassezia furfur is a constituent of the typical microbial community and is spread through direct physical contact. Pityriasis versicolor is a prevalent infection that is found globally, but is more common in tropical regions. It is also more prevalent among individuals who have received a kidney transplant and those with AIDS.
 

Pityriasis versicolor presents as desiccated, flaky, hyperpigmented, or hypopigmented patches on the trunk, upper limbs, and midsection. Malassezia furfur has the potential to induce systemic illness in individuals undergoing intravenous intralipid treatment, as well as seborrheic dermatitis in patients with AIDS.

Pityriasis versicolor is not linked to a host immune response, and there are no known virulence factors associated with it.

Upon direct microscopic observation of scaly lesions in a KOH preparation, a distinctive "spaghetti and meatballs" look of yeast and hyphae can be observed.
 
Pityriasis versicolor is commonly treated using topical applications of selenium sulfide or miconazole. Maintaining good cleanliness is crucial for preventing diseases.