clear like cyst

[Feddish]

There is a clear like cyst growing on my live rock, the out side is completely clear, then there is another layer that is a bit more opaque, then on the inside of that there is white like (digestive?) system in it. I have been watching it for aboout a month now and have not noticed any changes, but it looks like something that would hatch out of. I am going to try to get a pic of it, but it being basically clear I am not sure how that is going to turn out.
HELP
Diane

[iVgOnMaD]

pics please I want to see it too