Hi! Long time lurker, but figured out that I'd reach out and see if I could get some perspective on an incident with DD 11 and a few of the mums at school, a while back.
DD is very pale skinned with dark hair. She has been teased in the past by other kids, but we make sure to allow her to shave, wax and do whatever else that will help her self esteem (I suffered from the same problem as a child.) DD was checked by an endocrinologist and had her blood tested to see if there were any imbalances, but unfortunately, her body hair is due to genetics.
DD attended a sport carnival at school, before the end of term. After running in a race, she recovered near a group of mums. One of the mums told her that she ran like a man. Another chimed in and told her that she had the facial hair for it, too. They all laughed at her and she felt embarrassed and ashamed - so much so that she only told me about this now after school has ended 
I'm angry for her and devastated that this has happened. Her feelings are hurt and I can see that it has affected her self esteem. I don't know what to do though, as this happened a while ago. I know the mums and am just furious that they have shamed her body. I don't even know where to begin.
If my DD was your DD, what would you do? Thanks!