Those cups always do that and are crap for growing in so just transplant into something else. Not a dangerous type of mold to worry about tho. Mold spores are everywhere all the time but not a good idea to breathe lots of it.
If I am looking at those correctly aren't they supposed to be a biodegradable/plant them in the grow type of pot? If not, "lightly" wipe down, DON'T SOAK POT . . . with alcohol.
Do you think it will effect my plants in anyway?