Pityriasis rosea

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Pityriasis rosea is a type of skin rash. Classically, it begins with a single red and slightly scaly area known as a "herald patch". This is then followed, days to weeks later, by an eruption of many smaller scaly spots; pinkish with a red edge in people with light skin and greyish in darker skin.

Excerpt from the Wikipedia article “Pityriasis rosea”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Evanherk at Dutch Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.