Is it possible to remove a scar on the back side of my head from a hair transplant surgery? If, so what is the best option?

Yes this is absolutely possible.  You can either have the scar excised and closed with the newer techniques that allow hair to grow out of the scar.  You can also have an FUE procedure and have grafts placed into your scar.  

Hair transplant scar repair can be achieved by inserting grafts extracted through Follicular Unit Extraction( FUE) into the scar tissue. With this approach, the scar can be sufficiently hidden so that it is no longer visible. Here is an example of a patient from the Dr.U Hair Clinic who underwent a strip scar repair while replenishing the areas of non-growth which resulted from his previous procedure . His before and after photos show that inserting Follicular Unit Extraction grafts into the rather large strip scar was quite effective at concealing it. In fact, many of our patients can wear a short buzz cut after this type of scar repair.

You generally have two options: (1) Scar revision - at BEST this will give you about 50% reduction in width, (2) Scalp MicroPigmenation SMP - this will not remove a scar but will help hide the scarSee video