Hair transplanted from one region to the other retains its original characters and hence growth is possible. In case of alopecia areata the transplants do not survive. Is the defect in the hair or in the follicle? Why does hair transplant become unsuccessful in the area of alopecia areata?
Mostly alopecia areata have been linked with autoimmune reactions. Some of which can also be caused transiently due to stress and depression. Certain chemicals like modafilin also induce alopecia areata but however withdrawing from the dose worked to restore hair growth in case I have observed and restarting the dose restarted alopecia areata. while withdrawing again , again restored hair growth in same area. This might be indication of some sort of chemical accumulation at the follicles. Hence going by logic of what I have observed and what u have said about the transplant I would say iy has to with cellular components underlying the area of alopecia areata.
PS: I am just a molecular biologist and biotechnologist, hair is not field of my study; what I described was purely based on logic and one case.
Other than the failure oh Hair Transplantation in Alopecia Areata in most cases of AA , the presence of the Koebner phenomenon in A.A ( http://omicsgroup.org/journals/HTT/HTT-1-101.pdf ) confirm that its problem is in Skin Immune System and not in HF.
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