Dear Lisa,
The situation requires some professional intervention. Two possibilities, not mutually exclusive, are
TrichotillomaniaTrichotillomania - top of the head and
TouretteGilles de la tourette syndrome's Syndrome. The former is an impulse
controlControl
Control rx disorder; the latter is a tic disorder involving both vocal and motor tics. A good place to begin is with the pediatrician and then, probably, proceed to a child mental health professional and/or a pediatric neurologist.