My hair hasn't been oily and has been always healthy. I have been long straight hair. 

Even though I slept often without drying well, it was healthy. My scalp... 

Could the skin type change at a sudden?

Suddenly the scalp is turned out wrong, so I was told that I have to wash and dry my hair well.

1) I dried diligently but my hair was being worse.

2) While googling shampoo, I found that Castor oil is good for the scalp. So, I bought it through Amazon.

3) I used another famous shampoo even though it was highly expensive.

4) I bought a subacidic shampoo.

And then...Itching becomes so severe that the dead skin cells spread more and more to the scalp, 

and so does the back of the ears. 

Look at the photo, It's dirty but I'm writing with deep appreciation.

A hairdresser told me that my scalp is so terrible that I need to get treatment for getting my hair perm and dyeing. 

Finally, I was refused to do perm and dyeing... now I got two-tone hair.

In the meantime, one of my friends went to a dermatologist because of a scalp problem. 

And she gave me a recommendation of Ballvic. But it was too expensive... 

anyway, it did an event, so I log in and bought a small size one to see how effective it would be.After the first shampooing, 

more dead skin cells appeared a lot and more. 

I felt that I'm wasted...BUT... Like a lie, the itching has disappeared...