Sometimes a hairspray or styling product may cause a little build up around the surface of your scalp. Look at the label and make sure your shampoo is a cleaning or cleating shampoo. Their purpose is to get rid of build-up and keep your hair clean allowing a conditioner to work. Sometimes if there’s too much build-up the conditioner you put at your scalp can’t reach down to the root where the root of the matter is. No pun intended.
The only caution when using a cleansing shampoo is that if you just had a dark or red colour it will fade it faster then a regular moisturizing shampoo. Ask your stylist what you can do to help that, they probably have the product that will fix both problems.