A white spot can be many things. Sometimes it can be as simple as a scale which is damaged. Can you give more info on the spot? Is it raised or flat, fuzzy and soft looking, slimy? How long has it been there? There are times when treatment needs to start ASAP but also times when watchful waiting is the best. Shotgun style treatments can really mess with the tank bacteria and create ammonia spikes which can lead down a slippery path if the treatment is not needed.
I'm slow to go for meds as they are so hard to get it right and can be such problems. For me, this is a time to wait and watch. If it gets bigger, then try to find a cure. Many times spots will just come and go. I have found they are often small bumps from running into something or from other fish. Almost all my fish are cichlids and they do sometimes just get rowdy. I've got one old boy who just can't avoid the center brace and he often has a peeled spot but it heals.
Sorry. The picture has to be really clear to get a feel for what it might be. Even then pictures are not as good as eyes on.
But then it has been several days and you may be able to tell us more that will help. Is the spot changing? Over several days, fungus might be expected to grow thicker and begin to show some depth or spread a bit wider. If it is a scrape, I would expect it be look somewhat different as fish often heal quickly.
Any changes to report?
In the meantime while debating, keep the water good and clean. Don't clean so well that you kill the bacteria, though. No tearing the tank down for a total clean so that the fish are stressed. For occasions when there is just "something", I like Pimafix and Melafix. They are both pretty easy and very safe to use even together. They will not kill bacteria or upset other things in the tank. They are also cheap enough that I don't mind using them when in doubt as to what I'm seeing. They may not be the final best answer but then I don't buy twenty dollars worth of meds to treat a five dollars fish who may die anyway. Good water is my first line med.