To my knowledge, I don't believe they'll spread to other LPS or SPS but certainly can spread to other zoas if you have any.
The first question is are you sure it's pox? If so, here is a good resource for treatment. Went through it a couple of years ago and it worked quite well.
@Jd250
I would recommend reposting your picture in this thread for reference -- what strikes me as different between your photo and the one linked by @dbl is the uniformity of the 'spots' in your photo. Just an observation...