formication

/F AO1 R M IH0 K EY1 SH AH0 N/
noun
  1. 1

    An abnormal skin sensation similar to that of insects crawling over or within the skin; a tactile hallucination involving such a sensation. A common side-effect of substance abuse, it can also be experienced with high fever, menopause, skin cancer, diabetic neuropathy, or herpes zoster.

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Source: https://en.wiktionary.org/wiki/formication