I been having scabs on my scalp all over since I was like 13 years old these scabs used to come and go and was never taken to dermatologist. I m now 21 and they are back but have not gone away for months they spread all over my scalp now. They are flaky itchy they and this yellow sticky liquid comes out and turns hard as a scab and makes it even more itchy....what is it and what can I do to make it go away for good?