Hair loss, or alopecia, isn't just a problem for adults. Hair loss in children is responsible for an estimated 3% of pediatric office visits in the U.S. Whether your child has thinning hair or distinct bald spots, the loss of hair can be frightening. The good news is that, with a proper diagnosis, most cases of hair loss can be treated successfully. Medical Causes of Hair Loss in Children For the majority of children 26 months or older suffering hair loss, one of the following conditions is the cause. Your child's pediatrician or a pediatric dermatologist should be able to diagnose these conditions and prescribe the appropriate treatment. Tinea capitis. Tinea capitis, commonly known as ringworm of the scalp, is a fungal infection often seen in children. It can show up in a number of ways, but often as scaly patches of hair loss on the head. The patches are usually round or oval. The hairs may be broken off at the surface of the skin and look like black dots on the scalp. If your child's doctor suspects tinea capitis, a microscopic examination can confirm the diagnosis. Treatment usually involves an oral antifungal, such as griseofulvin taken by mouth for eight weeks. Your child should also use an antifungal shampoo such as selenium sulfide or ketoconazole to decrease shedding of the fungus.