It's right above his eye, like where it meets the rest of his head. Kind of looks like an angry eyebrow. There doesn't seem to be much else wrong with him, he's swimming around a lot and eating fine. He's black/very dark purple, so any other spots would be really easy to see, and there are none.
What size is your tank? 5G
What temperature is your tank? 80
Does your tank have a filter? yep
Does your tank have an air stone or other type of aeration? no
Is your tank heated? yes
What tank mates does your betta fish live with? none
What type of food do you feed your betta fish? Nutrafin Max. Literally all I could find in 3 different stores.
How often do you feed your betta fish? Morning, night, 2-3 each time.
How often do you perform a water change? Twice a week, only one so far though.
What percentage of the water do you change when you perform a water change?
What type of additives do you add to the water when you perform a water change? 50%
Have you tested your water? If so, what are the following parameters? Haven't tested, but just changed it yesterday, after him having been in there for about 3 days.
Symptoms and Treatment
How has your betta fish's appearance changed? Little white dot above one eye.
How has your betta fish's behavior changed? I don't think it has. He swims back and forth in the back or front of the tank a lot.
When did you start noticing the symptoms? Late last night or this morning.
Have you started treating your fish? If so, how? Nope
Does your fish have any history of being ill? Just got him
How old is your fish (approximately)? Forgot to ask at the store, but he seems small.
I've tried to get pictures, but it's a really small dot and he keeps moving too.