What Is The Remedy For Itchy Scalp?

My 20 year old son developed an itchy scalp (not dandruff) and then noticed that people at school and at soccer

practice smelled a bad odor which he cannot smell. He went to a dermatologist who gave him sulphur shampoo and a lotion for itching. But after 1 week, no improvement in either symptom. An appt. with a different dermatologist

turned into a phone consultation and a prescription for a shampoo that decreases the oil on the scalp. I would

like to find a Dr. who can tell me what he has and exactly how to treat it. Please help. Vicki