I have very dry skin on my scalp and have been to the dermatologist in the past and have something called betamethasone solution to put on it. It's been about two weeks and its getting worse. How do I know if I have an infection?

First and foremost, it's not lice! It's just very bad dandruff. I use a medicated shampoo-tried the T-Gel and have switched to another kind since I have heard that your head can get used to it and stop working.

So do I call the dermatologist again wait for another appointment or do I wait another week. It's almost painful to even tough my scalp because its so raw. Any help or suggestions are really appreciated.