Don't know, but I suppose a plug in air freshener of the type that spritzes a shot every so often might be an issue if it's either: a) near enough to an exposed air pump for it to suck it in or b) at or above tank lid level. If that's what it is I'd basically expect symptoms in your whole tank. Otherwise seems like a long shot.
Based on your photo I'd suspect an injury as most likely. Appearing suddenly fits this scenario, even more so if it's just one or two of them-- unless the damage is spreading rapidly on the same fish. Otherwise my standard treatment for scuffs, minor wounds, etc. typically ranges from a little salt, to a little Melafix, to meth blue. I do Melafix at low doses, mainly because of the fast breathing it can cause. I find something like a 1/4-1/3 label-recommended dose of Melafix typically works just fine and lessens the fast breathing thing (which is normally temporary and not a big deal ime). Years ago I used to use an aloe containing med for similar purposes, and since aloe is organic, and according to some sources adds to bio-load, I didn't overdo that either.
...I rarely get sick fish, have dealt with plenty of scuffs and injuries, but beyond mostly minor health issues I'm not an expert, though with Cyphotilapia egg bound females is sometimes an issue and I have some experience with that.
Based on your photo I'd suspect an injury as most likely. Appearing suddenly fits this scenario, even more so if it's just one or two of them-- unless the damage is spreading rapidly on the same fish. Otherwise my standard treatment for scuffs, minor wounds, etc. typically ranges from a little salt, to a little Melafix, to meth blue. I do Melafix at low doses, mainly because of the fast breathing it can cause. I find something like a 1/4-1/3 label-recommended dose of Melafix typically works just fine and lessens the fast breathing thing (which is normally temporary and not a big deal ime). Years ago I used to use an aloe containing med for similar purposes, and since aloe is organic, and according to some sources adds to bio-load, I didn't overdo that either.
...I rarely get sick fish, have dealt with plenty of scuffs and injuries, but beyond mostly minor health issues I'm not an expert, though with Cyphotilapia egg bound females is sometimes an issue and I have some experience with that.