Plaque: skin lesions are red at the base and covered by silvery scales 
There are five different types:
Plaque: skin lesions are red at the base and covered by silvery scales
Guttate: Small, drop-shaped lesions appear on the trunk, limbs, and scalp. Guttate psoriasis is most often triggered by upper respiratory infections.
Inverse: Smooth, red patches occur in the folds of the skin near the genitals, under the breasts, or in the armpits. The symptoms may be worsened by friction and sweating.
Erythrodermic: periodic, widespread, fiery redness of the skin
Pustular: involves either generalized, widespread areas of reddened skin, or localized areas, particularly the hands and the feet (palmo-plantar Pustular psoriasis)