+1 on Josh's reply.
Without a picture no one can say for sure. It could very well be zoapox, or, if they are palythoas, you will see white, whitish, pale white to cream color specks imbedded within the stem/cuticle of these polyps. It is sand and sediment that they take up to strenghten/stiffen their stems which is absolutely normal and nothing to worry about. These sand and sediment specks will appear smooth to the touch where as zoa pox will be raised and often more whitish and pronounced. A clear picture will help to determine which it is. Good luck.
Mucho Reef