It's possible it's new tissue growing back, it can happen after the coral dies. Not sure on the type of coral though. From what I can see of the skeleton, possibly a chalice??
Keep an eye on it and don't discard it. We lost a chalice colony and after months of the skeleton sitting in the tank my wife noticed little tiny pink spots you could only see under blue lighting. Here's a pic of the chalice colony and new growth months after it was completely gone. Corals are amazing animals.