Does it block when we have skin to skin contact with someone who is using a topical product containing salicylates?
Not much to worry about with the general public at all – even if you are shaking hands with people. It can generally be assumed that such topicals have been absorbed well before you come in contact with them. Your spouse/lover is another matter however. If s/he has just applied a sal-full lotion, lip balm or lipstick etc., and there is lots of intimate contact, it could transfer to you just as if you had put it on yourself. Don’t worry too much about casual contact, but if you find yourself in intimate situations where you know the product has been recently applied is rubbing onto you, it’s a good idea to help them to find sal-free products.