Well, in this forum you can talk all the spoilers, but the titles of the threads are usually visible on the front page whenever there are new comments, so someone who hasn't read the books might see the title. This is why we advise keeping spoilers off the titles as well. (hence why I removed...
Actually we have an interesting tidbit about your question in the Library:
https://library.tarvalon.net/index.php?title=Healing
I actually always thought that Nynaeve healed Logain in one way, because she tested on him specifically, and that is why she couldn't heal Siuan and Leane the same...