Help me with my skin problems?

I have had scalp problems for as long as I can remember, 10+ years. Dry red flaky patches all over. Now it’s spread to my face. Dry red flaky patches. Nothing helps. Dandruff shampoo doesn’t help my scalp, and it doesn’t help my face either because I’ve tried. Coconut oil does nothing. Tea tree oil does nothing. Moisturizers and lotion do nothing except keep the flaking at bay for around 5 minutes. I can’t afford to see a doctor. Any suggestions or ideas? My dad had it as well, and he said he grew out of it, but only on his scalp. I’d rather not just wait to grow out of it unless I absolutely have to.