My daughter is 13 years old and is a normal, healthy teenager. Her hair strand has always been thin and light, and she keeps it shoulder length. I noticed six months ago that her hair even after washing quickly become oily and and a bit smelly around the crown. Thinking back now , about two months ago she complained that a lot of hair was falling out when she washed it in the shower. This last week she has developed a bald spot about the size of a dime and is very upset and embarassed. She likes to play with her hair when reading / studying but I don't believe this is the cause. Should I go to our family doctor or buy something obver the counter first ??