Sorry if I am over reacting, but I don't want to leave it unnoticed and it turn out to be something major.
You can kind of see right to the left of the black line (his gill?) that there are a few marks... I am trying to get a more recent picture, but it seems to be on both sides, and maybe some on the bottom, but I am unsure at the moment. They almost look metallicy ... not sure.
Some of the marks in this picture are air bubbles, but I think you can differentiate it.
What size is your tank? 2.5 Gallon
What temperature is your tank? 78-82
Does your tank have a filter? No
Does your tank have an air stone or other type of aeration? No
Is your tank heated? Yes, minimal
What tank mates does your betta fish live with? None
What type of food do you feed your betta fish? Aqueon Betta Food
How often do you feed your betta fish? 2x day, 3-4 pellets each
How often do you perform a water change? (new tank) plan on 2x/wk
What percentage of the water do you change when you perform a water change? (new tank) plan on 20%
What type of additives do you add to the water when you perform a water change? Top Fin Water Conditioner
Have you tested your water? If so, what are the following parameters? No
Symptoms and Treatment
How has your betta fish's appearance changed? White dots seem more prevalent than when purchased
How has your betta fish's behavior changed? Nothing bad
When did you start noticing the symptoms? Few days after purchase (owned for ~2 weeks)
Have you started treating your fish? If so, how? No
Does your fish have any history of being ill? n/a
How old is your fish (approximately)? 2 weeks in my possession.