Will my follicles from donor area grow back?

No, everyone has a finite number of follicles. Once the follicle is removed from your donor area, it will not regenerate. The tiny incision where it was removed will heal over short time, and so will any marks or scars will fade. However, remember that the donor area is handled strategically so that the neighboring hairs can grow back and cover the tiny incisions and not be visible to the naked eye.