formication
蟻走感
for·mi·ca·tion /ˌfɔrməˈkeʃən/ 名詞
For·mi·ca·tion n. Med. A sensation resembling that made by the creeping of ants on the skin.
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formication
n : hallucinated sensation that insects or snakes are crawling
over the skin; a common side-effect of extensive use of
cocaine or amphetamines