Safe amount of time to use Toppik on donor area after FUE?

I recently had a second FUE HT. The nurse was pretty aggressive with shaving and there's no way my existing hair can be combed or styled to cover my donor area - it looks very obvious I had a HT. I've been cleaning the donor area daily and putting on antibiotic cream. When can I start to use Toppik to cover the donor area without infecting myself or impeding hair regrowth that's still around in the donor area? I have to go back to work at the very latest 12 days post-op. Thank you!