The major types of psoriasis include the following.
- Round or oval sores that may expand into patches.
- Sores that are red and covered with loose, silvery, scaling skin.
- Sores that are usually found on the elbows, knees, and trunk.
- Many small sores the size of small drops of water.
- Sores that develop suddenly, usually on the trunk, arms, legs, and scalp.
- Outbreaks of sores that may occur with a cold or other upper respiratory infection. The sores also may occur after an episode of tonsillitis or strep throat.
- Joint symptoms that occur before, at the same time, or after skin symptoms develop.
- Joint symptoms in the hands and feet.
- Joint and skin symptoms that are long-lasting and return often (chronic). Symptoms can range from mild to disabling. A chronic, low-level bacterial infection or a serious joint injury in people who have psoriasis may trigger arthritis. The joint symptoms usually improve after skin symptoms improve.
Inverse psoriasis includes sores that are:
- Large and red and very inflamed and dry. There is not a lot of scaling.
- Commonly found in the skin folds near the armpits, under the breasts and the buttocks, in the groin area, around the anus, behind the ear, and on the face.
Pustular psoriasis is another type, and its symptoms include:
- Fluid-filled (noninfectious pus) sores that appear on the palms of the hands and soles of the feet. The skin is very scaly.
- Larger affected areas of skin (plaque) or small, drop-sized sores that may also appear on other body parts.
- Nail changes.
- Flares that occur after you stop taking certain medicines (such as oral corticosteroids) or stop using certain creams (such as high-strength corticosteroid creams).
Erythroderma, or exfoliative psoriasis, is an extremely rare form that may be disabling or fatal. People with erythroderma may have: