Psoriasis

Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by Skin plaques.
These plaques are red, or purple maybe darker, dry, itchy, and scaly.
Psoriasis varies in severity from small, localized patches to complete body coverage.
Trauma can trigger psoriatic skin changes at that spot, which is known as the Koebner phenomenon.

Plaque: Also known as psoriasis vulgaris, Prevalence: 90% of cases. It typically presents as red patches with white scales on top. Areas of the body most commonly affected are the back of the forearms, shins, navel area, and scalp.
Guttate: It has drop-shaped lesions.
Inverse: It forms red patches in skin folds.
Pustular: It presents as small, noninfectious, pus-filled blisters.
Erythrodermic: It occurs when the rash becomes very widespread, and can develop from any of the other types. Fingernails and toenails are affected in most people with psoriasis at some point in time. This may include pits in the nails or changes in nail color.

Psoriasis is generally thought to be a genetic disease that is triggered by environmental factors.
Symptoms often worsen during winter and with certain medications, such as beta blockers or NSAIDs.
Infections and psychological stress can also play a role.
The underlying mechanism involves the immune system reacting to skin cells.
Diagnosis is typically based on the signs and symptoms.
There is no known cure for psoriasis
The disease affects 2–4% of the population.

Psoriasis is associated with an increased risk of psoriatic arthritis, lymphomas, cardiovascular disease, Crohn's disease, and depression.
Psoriatic arthritis affects up to 30% of individuals with psoriasis.

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