Mystery orchid has brown spots!!! Please help!

[PrognatusAfera]

Hey everyone, I could really use some help, please! I won a mystery orchid (I think a Cattleya?) in a raffle at a recent orchid society meeting, and it was the last one left on the table, as it has spots. I've brought it home and kept it apart from the rest of my plants, and watched it for a few days to see if I could see a multiplication of spots or not, but I can't really tell, and nothing seems to be changing, besides that the spots really bother me. They're little dark spots (I think little craters) on the leaves and on some of the pseudobulbs. One of the pseudobulbs appears to be brownish purple, too, and I don't know if this is normal or not, or if it is related to the spots.
I've posted some pictures--does anyone know what's going on with this plant? Or what I should be doing about it, besides keeping it from contacting the rest of my collection?