Discolouration and Psoriasis?

I would agree with the GP diagnosis, specifically plaque psoriasis (there are other sub-types). These are thick, well-demarcated `islands in the sea`, red plaques with silvery scale. Often manifests before 4oth birthday and a history of other family members also having some form of psoriasis and can, unfortunately, be resistant to treatment. I have attached the British Association of Dermatologists guidelines for psoriasis, which provides the most up-to-date treatment regimes, including PUVA or photochemotherapy is a type of ultraviolet radiation treatment. You could ask your GP to refer you to a Consultant Dermatologist who will have a greater armamentarium for treatment options in psoriasis.

With regard to the pigmented rash on the top of your foot, this could also be a psoriatic lesion, but lacks the usual features. Without knowing your ful medical, occupational and familial history I cant really offer a diagnosis.

Hope that helps,
Bel