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I've heard of this problem before. Don't think anyone ever figured out what it was that caused it. Some reported pests, others found none.
I remember one person saying they dipped them in a mixture of 75% tank water and 25% peroxide and that cured them. Other people said they had no luck saving them and their best option was to frag some "healthy" looking ones and put them in another tank.
I would say to either try the 25% peroxide dip or dip it in lugols iodine solution. I have no experience with the peroxide however the lugols iodine has worked great to strengthen/ heal corals.