I would suggest thinking of needing it to look similar to the extreme close up of the hair growth in American Werewolf In London or the hair growth of the bush from the recent Body Hair video that was posted here:
https://www.youtube.com/watch?v=z_wea5P6EuY. I'd think either one of those types of effects would work (yeah I know American Werewolf was practical effects). At least, if we're talking in a realm of transformation type work (which I think Missa might be after).