Somewhere that you can't see, basically. Does anyone else get paranoid that it's actually being caused by a stampede of raging ants? I do.

Last night I had a sort of nightmare and ended up thrashing around in bed thinking my body was covered in ants, all because I had a slightly itchy upper thigh. The thrashing around ended up with me banging the top of my head on the headboard. It hurt a little bit.