@bettaparadise -
With mine, if you looked from the front of the betta under bright light, you could see what looked like dust sticking to his sides XD I literally freaked out when I saw it, and his fins were sticking together, plus, the fact that he was blind didn't help much :O
If it is velvet; I treated my two betta's tanks with Aquarium Salt and then used Pond Ich+ (for ponds, but it did the trick). It also helps to do 75% to 100% water changes everyday. I also kept them in the bathroom since the parasites need light to survive.