I don't have experience with it or any real knowledge, but I do have a male cycling buddy that had a varicose vein in his "taint." He said that it went away spontaneously after being there for a long time and it never really bothered him riding. I'm sure you'd have to have a saddle that fit you well though, so as not to put pressure on it.
See, it isn't just us women, cyclists of both sexes are totally non-squeamish talking about body parts with their riding buddies. 
You might could ask your doctor just to be safe.
Speed comes from what you put behind you. - Judi Ketteler