my baby Oscar had something similar to that, white blots all over, even on the eyes. i suspected it to be HITH and did frequent water changes ad increased the temp in my tank by just a bit with brighter lighting, it was gone in two days. has your o been acting any diffrntly? cause mine, even with those weird stuff on it, still was eating hearty, wasnt flashing and was just fine. im no expert and still new to Oscars, but from what i understand, just try your best to keep the water in tip top quality. and maybe it will go away like it did with my O.