What you describe sounds like seborrhea or psoriasis of the scalp. It feels dry but isn't. Cause is unknown. It happens at any age from infancy on up and comes and goes. It is not fungal, nor is it related to weather, geography, or hair-care preparations.
My advice: Go to the drugstors and get a
therapeuticAbortion - elective or therapeutic shampoo (T-Gel, Nizoral) and use daily. See a doctor for a prescription for a cortsione-based scalp lotion. You should get very quick relief, though you may have to treat from time to time to control symptoms.
Best.
Dr. Rockoff