Type | Description |
Plaque (Vulgaris) | The most common form; appears as raised red patches covered with silvery white build-up of dead skin cells, most often on the scalp, knees, elbows and lower back; often itchy and painful, and can crack and bleed. |
Guttate | 2nd most common form (~10%); appears as small, dot-like lesions; often starts in childhood or young adulthood, and can be triggered by a strep infection. |
Inverse | Appears as very red lesions in body folds (e.g., behind the knee, under the arm or in the groin); may appear smooth and shiny. Many people have another type of psoriasis elsewhere on the body at the same time. |
Pustular | Characterized by white pustules (blisters of noninfectious pus) surrounded by red skin; can occur on any part of the body, but most often on the hands or feet. |
Erythrodermic | A particularly severe form that leads to widespread, fiery redness over most of the body; can cause severe itching and pain, and make the skin shed in sheets. It is rare (3% of people who have psoriasis during their life time), and generally appears on people who have unstable plaque psoriasis, can be life-threatening. |