It's Yom Kippur. Mr. Ploni is at home, praying the Amidah prayer with great emotion. He's crying, and his nose is dripping. Although it's a fast day, he wants to lick the snot off his upper lip.
If there's no tissue within arm's reach, may he do so?
Perhaps there are lots of tissues within arm's reach. But perhaps he wants to save time, money, and/or the environment, or he prefers not to use a tissue. If so, may he lick the snot off his upper lip?