Do people use concealers like Toppik or DermMatch while waiting for hair to grow after Neograft procedure?

Thank you for your question. You are far out , and, of course, you can use it but I would recommend to be very careful and utilize all those products as less as possible. You want to keep your scalp healthy for better results in the future. 

Good question. Yes, it is fine to use such products but I would wait at least 4 weeks.  This may be overkill, but you probable spent a lot of money on your head.  Better to be extra safe although I'm unaware that starting earlier will cause problems.

Thank you for your question. You should ultimately follow the recommendation of your board certified facial plastic surgeon. At the 4 month mark, new hair should begin emerging and will continue to grow normally.
Best wishes,