Is it a concern that spot was missed and hair wasn't transplanted in that area or there is a technical reason for this? (Photos)

This is an issue of supply vs. demand.  It appears that the grafts were not placed there and it is a judgement call by your surgeon.  Spread the grafts out means more covered area, but less density. That trade off can be unfavorable to your results.  Patients are often informed that a single surgery alone won't treat all that needs to be treated.  You should go back in for a conversation with your surgeon.

I do see the area that was not transplanted. It is likely that the number of grafts used to get you the density on the top of your head was the number harvested. That area that was intentionally skipped for you would actually require a fair number of grafts as the hair direction and the curve of your scalp are different. It is something for you to discuss with your surgeon as well, to see when would be a good time to fill in that area (if at all). I wish you success with your hair.Sincerely, Eric T. Carniol, MD

Hello, Thank you for your question and uploading the photos. Based on the photos, you did not have any transplant on the lower crown area, and had some on the upper and middle crown. Most probably the graft number was not enough to cover that spot. So you should not expect any hair growth there.