Whoa! I hope that doesn't grow into major necrosis mark. Well, I got a patch like that on my Chocolate Mint, but it hasn't spread. If I see that on a platygyra though, the coral is doomed. IME that is. Favia seem a bit tougher than platy's..
Thanks, it has plumped up some. Mine which is undecided whether or not its orange, purple, or red still looks like a Paper wasp nest. Thanks for the updated pics.
Matthew