What is the causative agent of tinea versicolor?

Tinea versicolor, also known as pityriasis versicolor, is primarily caused by the yeast Malassezia furfur. This organism is a type of fungus that normally inhabits human skin and is particularly associated with seborrheic dermatitis and other skin conditions. In the case of tinea versicolor, Malassezia furfur disrupts the normal pigmentation of the skin, leading to the characteristic hypo- or hyperpigmented macules or patches often seen on the trunk and shoulders.

Other potential options are not related to this condition. For instance, Trichophyton rubrum and Microsporum canis are both dermatophytes responsible for other types of fungal infections, such as athlete's foot and ringworm, but they do not cause tinea versicolor. Candida albicans, on the other hand, is associated with candidiasis and skin infections but is not a causative agent for tinea versicolor either. Understanding the specific role of Malassezia furfur in this condition is key to identifying and treating tinea versicolor effectively.