For Folliculitis Decalvans, I hope that you are under the care of a good dermatologist. This tends to be a an unrelenting chronic condition that can come and go without any predictability and unfortunately can leave devastating scarring patches of baldness in it's wake. That being said, if the disease appears "burned out," meaning that there has been no progression, no redness, no pustular areas, etc for over a year then you may consider consulting for a hair transplant. The survival of the hair transplant depends on many things. First of all, you can't transplant hairs/grafts as densely into scars as you can the normal scalp. You need good blood flow to the new growing grafts so you have to leave more room in between for them in the scar area. This makes the transplanted area thinner then may be desired. Also, the disease may flare up after the transplant, which will reduce the survival of the grafts. Any subsequent flares need to be treated immediately and aggressively to prevent loss of native hair and transplanted hairs. You will need to have continuous and close follow up with your dermatologist or your hair transplant surgeon (if she does both) in order to stay on top of this in the months and years to come after a hair transplant.