Today at work one of me colleagues was talking to me but I had no concentration on what she was saying because there was something on her nose and I was thinking about "how am I supposed to tell her?"
I just don't want her to get embarrassed or uncomfortable. I can simply wait until she goes to restroom and check herself but I just wanted her to know it immediately but I had no idea how not to upset her.
Is there any really polite way to say such thing without being rude?