Chiggers leave an itch long after they are gone. Dream books read them as a small encounter or remark that keeps bothering you well after the moment has passed.
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.