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What is psoriasis? Psoriasis is a long-term inflammatory disease that affects the skin and nails. The skin cells grow too quickly, causing red, scaly lesions that can be painful. Sometimes a person may have sore and inflamed joints as well. This is known as psoriatic arthritis. Psoriasis tends to come and go over time. People with psoriasis may need lifelong treatment to keep it under control. What are the symptoms of psoriasis? Psoriasis causes different symptoms in different people. Symptoms normally develop before age 45. The most common symptoms are dry, raised, red patches of skin (plaques) covered with silvery scales. The patches usually appear on the knees, elbow, lower back and scalp, but they can appear anywhere on the body. Psoriasis can also cause dents and discolouration of the nails. Some people get small, drop-shaped sores on the chest, arms, legs or scalp. Some people get swollen, painful joints. The symptoms of some rare types of psoriasis include pus-filled blisters or a red, peeling rash that itches or burns intensely.
