Webbing between the fingers belongs to creatures of water, so dream tradition reads it as adapting to an emotional or unfamiliar element. It can also mirror a feeling of being different from those around you.
Where in your waking life have you met something like this lately?
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.