I have also got p in my scalp, had it there for as long as i can remember. When i was young the school nurses used to visit and inspect our heads for lice. Me and my 2 sisters used to have hair so long we could sit on it, anyway my mum was informed i had lice and advised to seek treatment, this went on for about three weeks, mum got fed up and took me to the haidressers along with my sisters who were protesting violently at the idea of being "scalped"! After being given what was then very trendy haircuts we were sent back to school. Low and behold my mum was told yet again that i had lice, Fed up at this point i was taken to the G.P again where upon mum was informed that what i actually had was scalp p not lice, mum cried for hours at what she had done and what it had cost her.
In the past i have used run of the mill treatments but find the best one for me is Betnovate scalp application, if you have open sores on your scalp from picking it may feel like it is burning you but it stops the itch. I also use a fine tooth comb (like the ones for head lice) to remove any left over flakes caught in my, it stops dandruff effect on my collar.
NikkiC