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Home Disease Index Psoriasis
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Overview

Causes
Symptoms
Risk Factor

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Overview

 

Psoriasis is a chronic, recurring skin disease. Its scope can vary considerably; from mild outbreaks, where the person may not even be aware they have psoriasis, to severe cases, which can be socially disabling and, in rare instances, life-threatening.

In principle, people of all ages can get psoriasis, but the early-onset form of the disease is mostly seen in 16 to 22-year-olds and the late-onset form strikes those between the ages of 50 and 60. Psoriasis is derived from the Greek word 'psora', which means itch. Around 2 per cent of the population have psoriasis to a greater or lesser degree. Psoriasis is not contagious.




Causes

 

Psoriasis is a condition which runs in families, but the exact way in which the disease moves from generation to generation has not yet been established. Although the tendency to contract psoriasis is stored in a person's genes, it is by no means certain that it will ever develop.

However, exposure to certain stimuli (such as a streptococcal infection in the throat, alcohol, medicines and local irritation) or damage to the skin, may cause an outbreak of psoriasis in persons who have this genetic predisposition.

There are two main types of psoriasis: psoriasis vulgaris (plaque psoriasis) and psoriasis pustulosa (pustular psoriasis). The different types of psoriasis can be divided into subgroups according to severity, duration, location on the body and appearance of the lesions.

Around 6 per cent of the people who have psoriasis also get psoriatic arthritis in the joints. Psoriatic arthritis primarily occurs in fingers and toes, but is also quite common in the back bone.

 



Symptoms

 

Psoriasis vulgaris is the most common form. The first signs of an outbreak are:

  • red spots or patches.
  • the patches grow bigger and become scaly.
  • the upper scales fall off in large quantities, while the lower layers of scales are firmly fixed.
  • when the scales are scraped off, a number of small, bleeding points can be seen underneath.
  • psoriasis of the nail often manifests itself as small indentures in the nails. The outbreak can be so severe that the nail thickens and crumbles away.
  • flexural psoriasis occurs in skin folds (flexures). Red, itchy plaques appear in the armpits, under the breasts, on the stomach, in the groin or on the buttocks. The plaques are often infected by the yeast-like fungus candida albicans.
  • guttate psoriasis is a special variant which primarily occurs acutely in children and young people due to a streptococcal infection of the throat. Drop-like, scaly patches appear on the entire body. In many cases, the condition disappears by itself after a few weeks or months.

Psoriasis of the scalp can be difficult to distinguish from a severe case of cradle cap, and sometimes the two occur simultaneously. An outbreak of psoriasis often leads to lesions on the face.



Risk Factor

 

People who have family members with psoriasis, especially if they are exposed to stress, alcoholism, infections, medical treatment, or events such as divorce, bereavement or moving house.

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