I don't think my daughter is properly cared for when shes at her dad's. How can I get supervised visitation?

She has come home for a month with bug bites. I've spoken to her dad (who swears he can't see them even though I have pics and video) and her he'd rather argue with me about talking to him about them then trying to figure out where they are from. She's fallen off the couch while she was there and got a bump on her head that had I not seen the bump (he claims he checked her and there was none) that he never wouldve told me because it's "not a big deal". A couple months ago he also had a friend who was addicted to drugs staying at his house while my daughter was visiting. When I asked him to not have the friend there while my daughter was he told me I "can't control who he has in the house"