hi thankx for joinig the dermatalk skin care community.
Well, its very difficult to diagnose online just seeing at your symptoms because other disease also resemble the characteristic features of psoriasis. Direct clinical examination is necessary to proper diagnose it. Other disease that somewhat resemble psoriasis are:
Seborrheic dermatitis, hyperkeratotic hand dermatitis,pityriasis rosea,candidial intertigo and sometimes secondary syphilis,
it depends on site and type of lesion you have. usually but not always, what you have in psoriasis is that the lesion are well defined sharp edge with characteristic silvery,loose scales and are less itchy then other conditions as stated above and usually associated with nail changes (50% nail involvement and 10% with joint involvement.
I would suggest you to vist a doctor. He would do some test usually a quick and simple- Grattage test to find out and further suggest you accordingly.