oscars have tiny sensory pores on their head and these are most likely what your seeing.However oscars are susceptible to hole in the head and the sensory pores are one of the first places where disease manifests itself... i would like to see clearer pics if possible..as this pic is not clear enough to see any small holes... or scaly surface.In a healthy specimen these holes will be uniformly pinhole sized and arranged in small clusters.. in specimens with HITH the margins of these pores increase in size and overlap one another, and eventually become rather pronounced ugly pits.. i just happen to read this in TFM this month. white spots do not look like HITH but rather a scrape from a decoration or a fuss with another fish..
the exact cause of HITH has not been determined..some possibilities are poor water quality, improper diet, vitamin definciencies, and bacterial infections..to prevent it ... have extreme high water quality.. through frequent water changes.
