i don't know much about dreams; but one thing that is always popping up when reading about dream interpretations is this question: "What does it mean to you personally".
Are you under a lot of stress lately; or anything that has came up that may be upsetting?
I am not sure if that helps- I just know personally when I am very stressed out or a lot of things going on; I will have self mutilating dreams or argument/conflict dreams.

Dreams are a way to relieve stress I am always told. Maybe this dream of yours is just a way to relieve stress? Wish I could be more help.
Hope you have pleasant dreams to come