- how to treat dry scalp - treatment for dry scalp - itchy dry scalpbr br Until I found a book that pointed out that an itchy, br irritated scalp is a MODERN problem. Just 100 years br ago doctors didn't have anything to say about weeping br sores on dry scalps.br br The answer seemed clear. We're doing something different br today that people didn't do in the past.br br The culprit? Chemicals.