@INeedNewShoes you poor thing. That looks & sounds horrific
I went through a bad period for a couple of years a long time ago where I had a terrible eczema flare-up, extending into my scalp too & also diagnosed as seborrheic dermatitis.
I had a long road of being recommended coal tar shampoos & the line by my GP at the time. All pointless & with the severity of what you have I'd absolutely avoid at the moment if I were you.
I was under the care of a dermatologist who like yours, prescribed steroid creams of different sorts, some antibiotics, oral & topical when it got infected. It didn't resolve it.
In my case, a locum GP - who I feel forever grateful to - prescribed a strong antibiotic plus anti-fungal tablets. It was amazing. It cleared the initial problem up very significantly & then I could manage with some OTC treatments such as some of those PP have recommended.
In my view, you absolutely need a referral to an engaged & proactive dermatologist. Please revisit your GP to discuss. The current referral obviously hasn't worked at all.
For the moment, I'd avoid all the suggestions for coal-tar & similar, or other OTC treatments. Yours needs more than that. Nitty Gritty comb is an awful idea! You will absolutely destroy your poor sore scalp & yes, as it's so enmeshed in your hair, you'll take lumps out.
It's the underling cause, not the flakes (it's more than flakes I know 😥) that you need to address.
So:
- Return to GP for referral. List out as you have here, all you have tried. Be clear about severity, including hair loss & thinning.
- Secure dermatologist referral, hopefully someone with expertise in this & do the same re: previous treatments. You need medicalised treatment to try & clear it up to some extent.
- Once some progress has been identified you could look at underlying factors eg stress, diet, products used. (For me, the problem persisted for some years but never as bad & I could alleviate by being very pro-active when I saw the start of flare ups)
Although stress, diet, certain products are factors in eczema / skin conditions, they aren't the whole story as some PPs suggested.
I was so low when I had this condition & it wasn't as bad as yours (pretty terrible around my face tho, used to have flakes of skin falling off eg at meetings 🤢) so please be as forceful as you can getting a response.
Best of luck 💐