Pityriasis versicolor

Pityriasis versicolor is a skin disease that manifests as the appearance of small patches that vary from yellow to brown, mainly on the trunk and shoulders. After a few weeks of evolution, or during sun exposure, the lesions turn white. These patches can gradually expand to form larger plaques. The lesions do not itch in the vast majority of cases.

This condition most often affects adolescents and young adults and is not contagious.

The diagnosis is most often made in the summer because skin lesions become more visible when the skin is tanned.

Pityriasis versicolor is a skin infection caused by a yeast called Malassezia furfur. This yeast is normally present on everyone's skin, but pityriasis versicolor is caused by its transformation into a filamentous form that invades the superficial layers of the skin. It is therefore the transformation and proliferation of this yeast that causes the patches. Sweating can promote pityriasis versicolor.

Antifungal treatments, in the form of cream, lotion or shampoo, are generally effective. More rarely, pills to be taken orally are used. Despite treatment, skin discoloration may last for weeks or months.

Eliminating contributing factors is important to limit the risk of recurrence (oily cosmetics, occlusive or synthetic clothing, etc.).

Unfortunately, the infection frequently recurs.

You will find additional information on the website of a French dermatologist, Dr. Abimelec.