If this is one of your concerns, you can wear a hat or stay at home for at least three weeks because the surgical area will be shaved down in the operation to provide an ideal surgical environment and to protect existing hairs. Accordingly, it will be red and a little obvious for a while.
As time passes, the hair grows slowly. You may be asked some questions about the changes made in your new appearance but almost no one can say for sure that you have got hair transplant surgery particularly if minimal work has been done.