Which organism is responsible for causing tinea versicolor?

Tinea versicolor, also known as pityriasis versicolor, is a skin condition characterized by discolored patches on the skin. The causative agent of this condition is the fungus Malassezia furfur. This organism is a type of yeast that is normally found on the skin's surface and is part of the normal flora. Under certain conditions, such as hot and humid weather, it can overgrow and lead to the characteristic hyperpigmented or hypopigmented lesions associated with tinea versicolor.

Malassezia furfur disrupts the normal functioning of melanocytes, the cells responsible for producing melanin, which results in uneven skin pigmentation. The lesions are often more noticeable in individuals with lighter skin and can be exacerbated by sun exposure.

Understanding the role of Malassezia furfur in tinea versicolor highlights the importance of keeping in mind the typical skin flora and the environmental factors that can influence fungal proliferation. This helps in better diagnosing and effectively treating the condition.