Looks like moisture on the film, or scuff marks.
I have seen this with loose film or paper in a box that is shaken. The sheets scuff each other and can leave marks like this.
It could be either or both, or something wrong with the processing. Hard to tell from a scan.
I'm even having to assume that this is a positive image we are looking at, and therefore the edge marks and streaks are denser than the surround. The OP does not make it clear, and the image one that is hard to tell regards its polarity.
PE