To dream 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.... Ten Thousand Dream Interpretation
1- In dreams, a splinter can represent a minor irritation. It is something which has penetrated our defences and is now making us uncomfortable. Splinters may represent painful words or ideas. YVc may be holding on to ideas which cause negative feelings.
2- To be part of a splinter group in a dream suggests feeling sufficiently strongly about something to break away from mainstream thought.
To hit something which splinters is to rccognisc that we are all composed of parts which make a whole.
3- The sense of belonging to a group of like-minded people can only come after we have recognised our isolation or, in some cases, fragmentation.... Ten Thousand Dream Dictionary
Dreams of a splinter signify emotional injury that you have been carrying around unaware. You are dealing with a minor annoyance that causes you to be defensive and reactive. See Thorn.... Strangest Dream Explanations
Vision: Seeing a splinter: others want something from you and you are resisting. See Thorn.
Depth Psychology: Dreams about splinters are a sure sign of quarrels ahead and mean you are either rebelling against everyday problems or against sexual practices you find masochistic or sadistic and therefore unnatural.... Dreamers Dictionary