A public bath is read as cleansing in the company of others, sometimes with a sense of exposure. Tradition links it to renewal and to comfort or unease with being seen.
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.