Is there a word for the feeling like you have a spider on you?

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?

Solution 1:

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.

Solution 2:

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

Solution 3:

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.