My scalp has been itchy and flaky for weeks now. I change shampoos frequently because a dermatologist told me that build up from using the same shampoo over and over every day will cause itchiness, so I know it's not from that. I can't wear dark clothes, because it looks like it snowed on my shoulders. It's so bad. It's really gross and it is driving me bonkers. I've been using scalpicin, which takes the immediate itch away, but it doesn't solve the problem. Help!