If you dreamed about seeing a splinter, then such dream shows your tendency to worry about things which people have said about you or thinks about you. Make sure you care less of what other people thinks about you.
Dream dictionary: Splinter dream meanings
…Dreaming of splinters sticking into your flesh, denotes that you will have many vexations from members of your family or from jealous rivals. If while you are visiting you stick a splinter in your foot, you will soon make, or receive, a visit which will prove extremely unpleasant. Your affairs will go slightly wrong through your continued neglect….