SKIN OFF ONE'S NOSE

{n. phr.}, {slang} Matter of interest, concern, or trouble to you. Normally used in the negative. * /Go to Jake's party if you wish. It's no skin off my nose./ * /Grace didn't pay any attention to our argument. It wasn't any skin off her nose./ * /You could at least say hello to our visitor. It's no skin off your nose./