Hammer Coral Possible Disease or Breakdown?

[Henrique]

I was looking at my hammer today and I noticed that the bone or the think under it started to deteriorate, the coral is still open and looks normal but I noticed that and got a little worried because I have no idea what could possibly be

 

[commod0re]

Take pictures under white light, hard to see anything clearly in blue

 

[Henrique]

Take pictures under white light, hard to see anything clearly in blue

 

[Henrique]

Take pictures under white light, hard to see anything clearly in blue

 

[Henrique]

here from another angle

 

[Shirak]

Can’t see anything in your photos