The most common form of psoriasis is plaque psoriasis - about 80 percent of us who have the disease experience this kind - and typically you only have one type at a time. But psoriasis can appear in a number of forms; I've personally had two kinds: plaque and guttate. I was diagnosed with plaque psoriasis as a teenager, experienced remission on and off through subsequent years, and as often happens, a severe guttate flare (triggered by a case of strep throat) eventually turned to plaque...