I had a session with a lady today. After I pulled out I saw that my balls were covered in cottage from her pussy. Is that a health risk to me.

I would just take it as a sign that you did a good job and be happy. lol

Dude, go to the doctor and get the cure. Worse then Ebola!

Men can get a yeast infection too. He should wash everything down there extremely good and put talc down there for a few days to prevent getting it.

they call that a yucky fucky..

My wife used to get them on a fairly regular basis.  She was on a high protein diet with lots of exercise.  

7-11 days after the last day of a cycle, enter in "ovulation" (i.e. fertile period) where discharge becomes slightly stringy/more mucusy (think of egg whites.) It helps the sperm travel to have more goo...  
Yum, I know, great visual there.
I have never EVER heard or read (in all of my far information scouring) of anything foamy and/or lumpy.

Where are people getting their information?

There are various vaginal suppositories out there that may cause the cheese you describe. LOL!  
Some are used for lubrication, some are used to stablize the pH of the vagina, some are used to clear up BV or Yeast. All are unique in the sense it may clear up the initial problem, but it also may help shed some of the lining of the vagina where the bacteria or yeast is, causing cheese. There may or may not be a smell if there is no infection or one is clearing up, but yuck to the cheese!

Which can also happen if she is turned on and has some female ejaculation, not squirt, sometimes the vag juice can be more white and creamy than clear... Sometimes, it is a slight pH imbalance, or the beginning of a yeast... Not all ladies get full blown chunky discharge and itching. Anything can throw a vag pH off.

From googling OP"images ovulation secretion

Realizing what he doesn't know is the first step in his "recovery." Perhaps there is hope, however unlikely.

Hopefully so.