Psoriasis is a long-term (chronic) skin problem that causes skin cells to grow too quickly, resulting in thick, white, silvery, or red patches of
skin. Mycosis is fungal
infection of the
skin. Since the patch healed after biopsy and you are taking treatment, so it looks like a mycosis or fungal infection as psoriasis does not heal so quickly.
I hope it helps. Take care and regards.