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Psoriasis is a non‑contagious chronic disease that mainly affects the skin, nails, and joints. It is characterised by the appearance of reddish scaly plaques that are sometimes accompanied by pain and itching. It develops as outbreaks that alternate with periods of improvement if proper treatment is followed.

Psoriasis explained in first person

Professionals and patients explain how you live with the disease
Although we do not cure psoriasis, the treatments we use remain their effectiveness over time.

Psoriasis is a common, inflammatory, non‑contagious, chronic disease of unknown cause, which affects the skin, nails, and joints. It develops as outbreaks that alternate with periods of improvement if properly treated. Its evolution is unpredictable, but once it has manifested, it usually persists over time.

Classification of Psoriasis

Cutaneous psoriasis can present in different manners, and varies from person to person.

Arm with round spots in the form of a plate

Plaque psoriasis. This is the most common manifestation.

Girl with skin blemishes

Guttate psoriasis. In children this often presents with smaller plaques.

Person with spots in the folds of skin under the chest

Inverse psoriasis. It affects skin folds.

Hand with stained fingernails

Nails and joints.

How many people are affected by Psoriasis?

Psoriasis is a universal disease with a greater or lesser prevalence depending on the geographical area. Various studies have shown that its prevalence  is around 2% of the global population.

It affects both men and women, and, although it can occur at any age between childhood and adulthood, there are two age ranges where it is most frequent: between the ages of 20 and 30, and between 60 and 70.

There are genetic factors associated with its appearance, for which reason there is typically a familial tendency to develop the disease. When other family members are affected, psoriasis usually presents at an earlier age and is more intense. It is estimated that when a father or mother has psoriasis, the chance of a child having the disease is 25%.

Substantiated information by:

Felipe Julio Ramirez Garcia
Mercè Alsina Gibert
Paula Aguilera Peiro
Sara Gómez Armayones

Published: 22 February 2019
Updated: 22 February 2019

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