Swing your torch at it.

You don't like the look of that thing, and since you have a weapon of sorts you decide to put it to use. The worm seems not to notice until you've already hit it, jerking back as a an odd muffled scream seems to echo above you. The serpentine creature retreats, but before you can really star to decide what to do next, you notice growing bubbles dot the tunnel wall all around you. All at once they pop, spraying you with a strange fluid. It feels hot on your skin, but as you try to wipe it off you shudder as it feels like every inch of your palm is scratching an itch you didn't know you had.

You feel your skin flush hotly, you have goosebumps all over, and you suddenly become aware of a very slight breeze as your drenched skin becomes extremely sensitive to the tiny droplets drying. The effects of whatever you were sprayed with start to spread all over. The texture of your dress starts to drive you crazy as it rubs you with every slight movement.