Pyoderma gangrenosum

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Pyoderma gangrenosum is a rare, inflammatory skin disease where painful pustules or nodules become ulcers that progressively grow. Pyoderma gangrenosum is not infectious.

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

Image: Crohnie, Public domain, via Wikimedia Commons.