A minor or trivial matter; something of little importance.
それは小事だから、あまり気にしないでいいよ。
That's a small matter, so you don't need to worry much about it.
彼はいつも小事で腹を立てるタイプだ。
He is the type who always gets upset over trifles.
仕事に集中するために、小事はあとで片付けよう。
Let's deal with the small matters later so we can focus on work.