Can hair transplant on scar tissue cause hypertrophic (yet not necessarily keloid) scarring and if so, how it is avoided?
It is possible and common to conduct hair transplant on scalp for men and women and on facial beard areas for men ("beard filling" or "beard completion").
Both described transplants are possible to be done on scars and will usually be done by a dermatologist specializing in hair transplanting;
In small scars (say 10x10 millimter scars), it will likely be done by F.U.T (Follicular Unit Transplantation) method:
By this method, a cluster of human body cells typically containing one or two hairs, is transplanted from one organ to another or from one place in a single organ, to another place in that organ ? as with transplanting hair from beard_area_1 to beard_area_2 transplant to ensure hair similarity (beard hair is typically different in texture and size from scalp hair).
I understand the rationale as follows: the cluster of cells is transplanted in pre-made skin "digs" while the tissue is planted strongly between surrounding skin tissue, splinted to these by adhesion and get nutrients from adjacent blood vessels.Genetic control in the hair cells will allow hair growth cycle to occur.
My problem
From past reading in the websites of dermatologists and past watching documentaries on the subject,it is unclear to me if by hair transplants done on scars, there is a significant risk for hypertrophic (yet not necessarily keloid) scar development that might cause more aesthetic damage than improvement, especially in repeated process and if so, what pre or post actions can be done to reduce this risk.
My question
Can hair transplant on scar tissue cause hypertrophic (yet not necessarily keloid) scarring and if so, how it is avoided?
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