I went to the doctors yesterday so she could examine my scalp
She said she couldn't see any signs of 'disease' so doesn't think it's eczema or psoriasis etc but that it's probably because I have thick hair

I've had thick hair all of my life and never had any scalp issues
I've been prescribed a treatment with a steroid in it to use twice a day for 2 weeks, sorry can't remember the name of it as it was out of stock in the pharmacy so I am going back today to collect it. She said it can only be used for 2 weeks as it thins your skin so that sounds promising
The doctor said if the treatment she's given me doesn't work she's going to give me Dandrazol to try