Unusually long fingers are read as reach and dexterity — or, in older dream books, as grasping at more than is yours. The feeling in the dream decides which side applies.
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.