surgical spirit. You can get little bottles of it from superdrug or boots for under a quid. It dries spots out almost overnight usually for me or a couple of days max if its a big one. Its pretty harsh on the skin though so dont use it all the time but for an emergency its fabulous. Just dab it on with cotton wool as often as you like.
Ahhhh thanks guys. I think I shall buy a bottle of this tomorrow when I'm in town. I will use the toothpaste trick overnight although when I've done it before it hasn't really worked. I have to get rid of this for Monday! Gah. I always come out in spots when I'm stressed.
Use a cream/gel with 2% salaic (whatever) acid during the day and at bed (when nobody is around put an antibiotic cream on it and cover it with a bandaid.
Don't pick/pop at it and risk a scabbing though.
I'd pop it, but that's just me (and I'm a bad example).
Perfume (or yes, any alcohol-based product) will dry it out and I've done that before with fair success. Fair warning, it stings like a bitch.
I'd also recommend a product Boots and a lot of other folks do...Boots' used to be called ACT spot reducing agent or similar, but Tesco do an own brand too iirc. It's this gel that you plop on the offending spot (overnight is best, I reckon) and it's decent, though I haven't used it for a while. Hope it still exists!