This can happen after the brow lift if the tissue was under tension. The best thing would be to wait. This will improve and if not happy in six months, consider hair transplant.
What you appear to have is known as "shock loss" which can happen around incision lines especially if there is either tightness or blood flow issues. The way to approach this is first to just observe and see if the hair begins to come back over the first three months. After this and even before you may want to start a series of mild kenalog (steroid) shots dispersed about the bald area. The vast majority of patients experience almost complete regrowth of the shock loss hair.. Ultimately, if there is hair loss problems that remain permanent or visible scars you may be a candidate for hair transplantation to the bald areas which should take fine.
