the aspirin mask is *the best* because its so cheap, and its extremely effective. aspirin is salicylic acid and acetic acid- a BHA. it chemically exfoliates the skin, which is much more effective than manual exfoliation, because its more gentle and even. it makes your skin very soft, and help to get rid of blackheads and clogged pores. take about 4 uncoated aspirin (coated are fine, but they take longer to dissolve) and mix them into a paste with a bit of water in your hand. the paste will be crumbly, not creamy. apply it to your entire face. some people wait until it dries and starts to flake off, but i just rub it on and rinse it right off. you can do it every day if you rinse it off right away, or you can do it a few times a week. its on your skin for such a short amount of time that a negligible amount of aspirin is absorbed.