Dandruff or dermal disease?

[Young lady]

At my friend the skin of a head is very strongly shelled. We try to treat any more the first year. Tried or tasted and "nezoral" and other agents from perhoti-nothing helps or assists!
It can not a version of a dandruff, and dermal disease?
How it or he can be cured?
Yours faithfully, Young lady.

[Century Lebedjuk]

To cure, or hatja to remove or take off an ecdysis it is possible only having diagnosed. And it it is necessary to sample, soskoby and internally to look displays of illness or disease.