+1 probably be gone in a day or twoKind of looks like it scraped on the driftwood.
Don't give me too muchmoe214 credit as I still miss a thing here and there.
It doesn't look fungal from the pics that I can tell. It has a fuzzy/cotton wool appearance. Kid if looks like scales missing. Keep the salt and temp up.
How long has it been there? Can u get a closer pic of the area? Is the fish acting normal? Where's ur heater located? Tankmates? Water parameters?