Hi,
i have done chemo twice and found that moment when I walked into work wigless very hard. Especially as most of the people who I dealt with through work (not my colleagues) had no idea I had had cancer. I got a couple of comments like did I have a fight with a lawn mower. Since I had made the decision not to share publicly my breast cancer (except with my colleagues), mainly as I felt I would get no work done if I had to explain my story to everyone else, I just smiled at theire comments and kept working. I knew if I told them the real reason they would feel awful. After the first day it was easy and I sported my buzz cut proudly. I am sure some people guessed but had the good grace not to ask.
Good luck
Paula :)