Plz help : black clownfish w/ a whitish spot (not ich)

[edikpok]

My black female clownfish has this white spot on her side. It is quite big and looks like a scrape. Just looks whitish. She's had it for about 4 days and it is not getting worse (nor does it get better) . She looks a bit lazier than usual but eats like a monster.

It does not look like there is an infection / bloody spots within this white spot. Basically looks like the scales turned white.....

Any ideas?