The molehill carries the old saying about making a mountain out of one, so dream books read it as a small worry that may be growing larger in the mind than in life. It also hints at work going on out of sight.
When this appeared in your dream, what were you feeling?
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.