Pinkish-White Growth on Cory - HELP

[ucjtrc4]

Hi all,

We have a sterbai cory which seems to have this round pinkish-white growth above its mouth. It looks almost like the cory has a 'nose'. We are unsure what is the cause and how to treat it as we have already quarantined this cory for ~2 weeks but this problem still remains. We tried API E.M. erythromycin and later on, Furan2 with General Cure, but this growth still remains. The cory seems to still have an appetite and it doesn't swim erratically. I have included pictures below. Hoping that someone can shed some light or share any opinions on this!

[Kohei]

Maybe a sideview picture of your cory in water will help to identify better? It maybe just abrasion from knocking into glass?