Will the hair in the FUE donor area grow back again?

Thank you for your question and photos.Yes ıt will grow back.
the number of grafts a patient will need depends on the thickness of their hair and the extent of their hair loss, which can be determined by the Norwood Scale below.
During a hair transplant, grafts are usually removed from the ‘donor area’ located on the back of the scalp and relocated to a balding area. The back of the scalp makes a good extraction area due to the high volume of hair follicles that congregate within that region that are not affected by the balding process. Specialist surgeons will remove a small amount of tissue that can grow hair and relocate it to the desired area of the head without damaging them.

The donor area follicles are removed and transplanted to other areas of the scalp. Although follicles continue to generate new hairs as hair falls out, follicles do not regenerate. This is why it is crucial not to over-harvest the follices. I would think as the hair in the photo grows, you will not have visible bald spots in the donor area.

When we take out graft from donor area, we take out whole hair follicle and hair growth will suffer.This is expertise of the Hair Transplant surgeon how to take grafts so that there is minimum loss to donor area.

No, the hair won't regrowth. I see that you have scarring of the donor area after FUE technique. Your best option is micropigmentation of the scalp. It is important to look for an experienced company. Good luck.

The hair that are extracted don't grow back.
The hair that are left grow and cover
Since entire hair follicles and the surrounding cells are completely removed from beneath the scalp surface, hair re-growth in the donor site which has been extracted is not possible. Hair re-growth will only take place in areas in the donor site where the hair follicles were not removed.

However, since your hair transplant surgeon will harvest follicles from an area in the scalp with the densest concentration of hair, the effect will be barely noticeable. The remaining hair surrounding the extracted hair is more than enough to conceal the spots . Therefore it is recommended to keep hair at the back ( donor area ) little longer in length to conceal it properly

The follicle that is harvested from the donor region is taken completely out from the root. That particular follicle will now be transplanted to the recipient area where it will regrow. It is important to space out the harvesting within the donor region and not to over harvest so that the donor region does not appear thin.

I am sorry to see an overharvested extraction site.
Hair follicles that are entirely extracted will not regrow. Maybe some will be partially extracted and may produce some fine hairs.
However, in order to solve your donor problem you may want to look into donor restocking and scalp micro hair pigmenation.

Hair removed from FUE is gone forever. From the photos, it is clear that your donor area was over-harvested. The best treatment and only treatment for this is Scalp Micropigmentation.