Cyst-like problem

[Animal_fanatic]

I have a red wag platy along with a few other fish in a 10 gallon tank, I haven't even had them two weeks yet and I've noticed a problem with the platy (her name is Nova). And I don't know if it's from another fish picking on her or if she's actually sick. It's a large white spot on her. It's not cloudy, nothing trailing from it, and there is only the one spot. I don't know if she ran into the decoration but I haven't noticed her that uncoordinated. So i'm either assuming it's something i've never heard of (because i'm sure it's not ich b/c it's not small by far and there is only the one spot), or another fish is picking on her (b/c I do have a baby rainbow shark as well), or if she's just running into stuff.

I need help x.x I really want to help Nova I just don't know how.

[Animal_fanatic]

OH Thought I should add the water test strip lvls, in case Nova is sick, the GH was between 60-120, KH 120-180, and PH was around 8 (I know that's a bit high and i'm about to get 7.0 PH stuff tomorrow, Nitrite 0-0.5 and Nitrate 0-20.