2023-11-23 01:01:22
Pityriasis versicolor: what are those brown spots on the skin?
Have you noticed light or dark spots on your skin? Then it could be pityriasis versicolor, a common mycotic skin infection caused by yeast, the skin patches of which are often confused with sun spots.
Pityriasis versicolor is caused by the yeast Malassezia furfur. The condition is characterized by the appearance of finely scaly, well-defined patches of variable pigmentation (versicolor), lighter or darker than the surrounding skin, mainly on the trunk and shoulders.
Pityriasis versicolor is generally asymptomatic, although some patients may complain of pruritus (itching). The main symptom is the presence of scaly patches of different colors (beige, brown, pink, or white). The spots do not turn brown and if they are white they are more visible in the summer. People with naturally dark skin may see lighter spots and vice versa. The hyper- or hypopigmentation of the lesions can last for months and the risk of recurrence is high.
Pityriasis versicolor is a benign fungal infection and is not considered contagious. It mainly occurs in healthy young adults, although some people are genetically predisposed to the spread of this fungus. Other risk factors include heat and humidity, as well as a weakened immune system due to corticosteroids, pregnancy, diabetes or other conditions.
All topical antifungal drugs can be used to treat pityriasis versicolor. These include shampoos based on selenium sulfide or salicylic acid sulfate, a soap enriched with zinc pyrithione, and oral medications such as fluconazole. To avoid a new infection, doctors (GPs and dermatologists) recommend strict hygiene and regular use of zinc pyrithione soap.
Sources: https://www.nhs.uk, https://dermnetnz.org
Last updated: November 2023]
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