Hair loss on legs

Patient: I am a 48 year old male I workout 5-6 day weights and cardio training. I eat all the right foods everyday have been for years dont drink smoke ect. I am in very good shape however I have noticed that on a small area of both my legs from the calf down to the ankle on the right side of both legs the hair is dissappering. What could be going on? I feel great by the way no other symptoms of any kind.