The phrase "raises a question" is commonly used to indicate that a particular issue has been brought to attention and requires further consideration or analysis. However, there are a number of synonyms that can be used to convey a similar meaning. For instance, you might say that something "prompts inquiry," "brings up a concern," "sparks curiosity," or "invites scrutiny." Other options include "raises an issue," "poses a problem," or even simply "asks a question." Whatever the phrasing, the goal is to acknowledge that there is something that deserves attention and requires follow-up in order to fully address it.