White grainy buildup stuff fall from my scalp. Not really flaky, not build up either and defenitely not dandruff. Seborrheic dermatitis? and how to get rid of it permanently? I have tried, Neutrogena Coal Tar shampoo first time today and it completely got rid of it for now, will it just stay away now because the smell of Tar shampoo is so bad, I can t manage to use it regularly. ps. I ve keratosis pilaris on my arms, only other skin condition I have.