Hi doctors, My hair is falling very drastically. I'm 21 year old. I have experienced that some semi liquid (paste like) dirt accumulated on my skull when I rub it with my finger's nail. I thought it's dandruff and I used to use head & shoulder shampoo. But when I use shampoo, too much hair falls that time. And my hair are becoming less dense. So, please suggest me some way to get rid of this problem.