Can I Switch To Water-based Minoxidil For A Persistent Itchy Spot On My Scalp For Years Despite Using Nizral And Folica?

Hi ..I have one point at centre of the scalp which itches and when I itch something comes out like when we scratch some wound ..I asked doctor he gave me nizral shampoo and folica hair tincture ..I used this 2 for more then ten years but my problem is not solved I have very itchy scalp..I still feel very itchy at few points on the scalp especially at the centre ,same thing happens when I itch at the centre..i have developed very dry skin at the top of my forehead and below ear on my neck:.can I use water based minoxidil instead of folica.::