Syphilis is a treatable sexually transmitted disease.
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The name 梅毒 literally means 'plum poison' because the skin sores resemble plum blossoms. The disease was historically called 杨梅疮 ('bayberry sore') in Chinese medical texts.
memory
梅 (plum) + 毒 (poison) = 'plum poison' - the rash looks like plum blossom patterns on the skin.
