Psoriasis is classified by its different signs and symptoms as well as the location of the affected area.

Plaque Psoriasis: The most common form of psoriasis, Plaque psoriasis usually affects the scalp, elbows, knees, hands, feet and genitals. It features raised, thickened patches of red skin covered with silvery scales.

Pustular psoriasis: This form of psoriasis features pus like blisters.

Erythrodermic Psoriasis: The affected area is intensely red and swollen and covers a large part of the skin surface.

Guttate Psoriasis: The psoriasis appears as small drop like lesions.

Inverse Psoriasis: Smooth red lesions appear in the folds of the skin.

Psoriatic arthritis: This condition often occurs in conjunction with the skin related psoriasis. The joints become painful, stiff and swollen with decreased movement, morning stiffness and general tiredness. The condition is not dissimilar to rheumatoid arthritis in presentation.

Nail Psoriasis: Nail involvement is common for people with psoriasis. If affected the nails become pitted and may lift off the nail bed.