A new study has revealed that the effects of psoriasis are not just limited to the skin - the disease is also linked to arthritis and cardiovascular disease.
Psoriasis is a chronic disease that causes red, raised patches of skin.
The new study provides an overview of this sometimes embarrassing condition, what's known about it and how it's treated.
The symptoms of the disease include-patches of thick, red skin covered with silvery, flaky scales commonly appear on the elbows and knees, but can appear anywhere on the body.
They result from skin cells on overdrive, reproducing much faster than normal.
Doctors aren't sure why this overproduction occurs, although genetic and environmental factors likely play roles.
Psoriasis symptoms come and go and flare in response to triggers that can include infections, some medications, alcohol, smoking, stress, sunburn, skin irritation or injury.
The researchers have said that it is a systemic illness and doctors are finding that psoriasis is more than a skin disorder.
About one in four people with psoriasis develop a form of arthritis called psoriatic arthritis that can cause pain, stiffness and swelling in the joints.
Studies have shown that people with psoriasis face a higher risk of heart attack, stroke and other cardiovascular problems.
The underlying link may be chronic inflammation, which plays a role in psoriasis and heart disease.
While psoriasis can't be cured, a variety of topical and systemic treatment options can help control the condition.