I edited out some of the color just to see if it made things more obvious, but still very hard to tell.
It could be the beginnings of ick, if it were me, I'd bring the salinity up that least 3ppt (parts per thousand, just in case.
Looks like just scrapes or nicks maybe against the aquarium decor. Be sure to keep the water clean that bottom wound looks like it's getting a little red around it.
