A condition in which skin cells build up and form scales and itchy, dry patches. Psoriasis is thought to be an immune system problem. Triggers include infections, stress and cold. It is a common, long-term (chronic) disease with no cure. It can be painful, interfere with sleep and make it hard to concentrate.

The most common symptom is a rash on the skin, but sometimes the rash involves the nails or joints.

• Pain areas: in the joints
• Skin: rashes, dryness, fissures, flakiness, peeling, small bump, thickness, or redness
• Also common: depression, inflamed tendons, itching, joint stiffness, plaque, or small dents in nails

Treatment aims to remove scales and stop skin cells from growing so quickly. Topical ointments, light therapy and medication can offer relief.

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