Need help with psoriasis on my foot

Even try Dead Sea salt soap or bathing it in that or a small water bath with some Salt to manage it

Have you spoken with the doctor to get Dovobet cream

You can try putting lotion on your feet and then putting socks on when you go to bed, that helps keep it moisturized which can help the itching. Also any creams you night have for psoriasis on other parts of your body might help