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So, sometimes when you see a spider, or walk through a spider web, you have this terrible sensation of having a spider crawling on you, even though you know for a fact that it isn't happening. Is there a word for that feeling?

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Also see horripilation. –  Autoresponder Oct 15 '13 at 6:23
    
I'd call it an "over-active imagination" and somebody's been reading or watching too many science-fiction stories. :) –  Mari-Lou A Oct 15 '13 at 6:44
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Delusional parasitosis (Ekbom's syndrome), ...imaginary parasites are reported as being "bugs" or insects crawling on or under the skin; in these cases the experience of the sensation known as formication may provide the basis for this belief. WP –  Kris Oct 15 '13 at 7:03
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4 Answers

Perhaps the word you are looking for is formication:-

noun a tactile hallucination involving the belief that something is crawling on the body or under the skin.

The term originally referred to ants, but should serve quite well for spiders.

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Also, Delusional parasitosis (Ekbom's syndrome), ...imaginary parasites are reported as being "bugs" or insects crawling on or under the skin; in these cases the experience of the sensation known as formication may provide the basis for this belief. WP –  Kris Oct 15 '13 at 7:02
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If you felt like you had a spider walking on you I would say you have the heebie jeebies.

Urban Dictionary

A feeling of minor fright, anxiety, nervousness, apprehension, "the willies", phobic

That spider crawling on my neck gave me the heebie jeebies

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I understand "have the heebie jeebies" as "be nervous or depressed", and feel it is familiar but not really street-language. (British English - perhaps it is different in The States ?) –  ex-user2728 Oct 15 '13 at 8:34
    
+1. Wisconsin weighing in here. I've heard the heebie jeebies used this way, see also the creepy-crawlies. –  LindaBrammer Oct 16 '13 at 3:33
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It's called Ekbom's syndrome, a condition of 'invisible bug infestation' - a delusional belief that insects are crawling under the skin (basically a tactile hallucination) - and hence known as delusional parasitosis.

It was first described in 1938 by a Swedish neurologist after whom it is eponymously designated, and it is synonymous with dermatophobia, and parasitophobic neurodermatitis. One interesting feature of this condition is that it has been known to be psychologically contagious affecting another close associate (much like yawning) - a phenomenon known as Folie a Deux or madness between two.

Another pathologized name for this condition is Morgellons.

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The real sensation would be a tickle (very general term) ; if it is only in the mind, and specific to spiders, it is called arachnophobia.

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