Take the star out and cut its arm off with a pair of scissors, just above the rotting part and then put it back in the tank. Sometimes that helps and it will just heal over where you've cut it.
Is this a new addition? How long did you acclimate it for? If not a new addition have you had any salinity swings in the tank lately? These guys are pretty sensitive to salinity (and probably pH and a host of other things).
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