it's no skin off my nose
• used to indicate that one is not offended or adversely affected by something.
• "‘I've not much appetite, I'm afraid.’ ‘No skin off my nose.’"
Similar:
I don't care,
I don't mind,
I'm not bothered,
it doesn't bother me,
it doesn't matter to me,
it's of no concern to me,
it's of no importance to me,
I don't give a monkey's,
I don't give a shit,
