I have to agree with RedVelvet’s assessment, except that I would suggest that you avoid the Aspirin Mask altogether. I tried the mask (as directed) a few times a suffered massive headaches in each and every instance. In addition, my skin darkened (temporarily) afterwards. OTC Salicylic Acid treatments really aren’t that expensive so please refrain from jury-rigging your own Aspirin-laced versions; it’s just not worth it.