Are your children trichotillomania children? Yes? No? Maybe? Or maybe would it be more appropriate to expect a response like, "I really have no idea!" or "What on Earth are you talking about?" Let's begin at the beginning, with an explanation of what "trichotillomania" is, shall we? The word has its roots in Greek; the morphemes vouch for its meaning being "pulling hair madness."
But trichotillomania children don't just pull their hair; there may be times when they actually pull it out! And if you believe that those who suffer from hair pulling disorders only pull out the hair on their head - and their own hair - well, there is not really any less blunt way to say this, but you are wrong! If you have children, then stop worrying about the loss of your own hair and keep the cat in a safe place for long enough to take some sort of action, because the worst cases can be really ugly! Read on.
Hair pulling children, trichotillomania children - whatever you want to call them - when not being players in dramatic emotional episodes that Amy Winehouse would find it hard to ignore or dispel, have mostly normal lifestyles, even if they will be seen with bald spots in the most unexpected of places. It is just too bad that clinicians have classified it as a habit behaviour, right up there with nail biting and compulsive skin picking (onychophagia and dermatillomania respectively). OCD and physical disorders, for example stereotypical movement disorder, can be attributed to trichotillomania children. Furthermore, hair pulling children may also feel the need to note that people with hair pulling disorders pull hair because of how it looks or feels at a certain area.
But studies have shown that hair pulling children may suffer not only from social estrangement / alienation, but also decreased cerebellar volume (and who's to say that the latter, unlike the former, is immediately evident?). NB anxiety and depression - it may be worth pointing out to children that hair pulling children showing these things are likely to be or become trichotillomania children. Children who happen to be hair pulling children should also be warned against developing trichophagia (that is, eating or chewing the hair pulled); while extreme cases of this could be a prelude to Rapunzel's syndrome and even death, according to some sources. (I suppose tearing hair out violently enough is not that unlikely to result in something like brain haemorrhaging caused by relocated arteries).
...Big Question: how to treat it, get therapy? Drug therapy is an option; look for names like Fluoxetine (Prozac), Fluvoxamine (Luvox), Clomipramine (Anafranil) and Sertraline (Zoloft). Or you could go for hypnotherapy, but the best idea would Habit Reversal Training of psychotherapy which can stop hair puuling children from becoming trichotillomania children.