Dandruff or seborrhea?

[Nataha]

At me the head is scratched (not all), I scratch up to the first droplets of the blood, then days or puts-two is normal, then again I scratch (I try to constrain itself, but it simply itch any) and under fingernails or nails of flake with droplets of the baked blood (sore). What is it? And how to struggle with a dandruff? Shampoos from a dandruff help or assist only for a while and how to cure absolutely? Can, in a drugstore special shampoos to buy? - prompt the name.

[Not registered]

I have more than 10 years such phenomenon. The only thing that helped or assisted (for a while) - masks from a grated onion (napiform) on a skin of a pilar part of a head, at 1-2 o'clock before washing of a head. After one procedure the skin becomes absolutely pure or clean. But it is necessary to do or make it on a regular basis if it would be desirable to support or maintain such status.