I had a FUE hair transplant about 4 months ago. Growth has been pretty slow, basically only along the hairline but nowhere else I can see.
I used a particular brand of hair fibers that is cotton based for a few weeks in the second month. This particular type of hair fiber has lesser width than a human hair, and I am concerned that it may have somehow entered the hair shaft and damaged the root/follicle for the transplanted hair. I ended up shifting to Toppik afterwards, but am worried I somehow damaged my hair earlier.