Have you washed your hair, only to find flakes or a greasy spot on your scalp a day later? It can make you wonder: Is scalp buildup blocking my hair growth? Scalp buildup is common. The good news is that you can often manage it with a few changes to your hair care routine. But if your hair is thinning, buildup may be only part of the story. What Is Scalp Buildup? Scalp buildup is a mix of things that collect on your skin, such as: Oil from your scalp Dead skin cells Sweat Hai