What is growing on my Favia?

[lrosenberg5]

Hi All - Any idea what is growing on the side of my favia. I got a frag where you could see the skeleton on the side. On the side, I am seeing two white spots developing that are gooey/ soft.

Any clue what this is and if I should just leave it or try to scrape it off?

 

[JGT]

Sponge.