The flea is the image of small, constant irritation. Dream books read it as a minor annoyance or person that keeps jumping back no matter how often it is brushed off.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.