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What Is Psoriasis?

Psoriasis is a chronic skin disease. Researchers believe this condition develops from a combination of immune, genetic, and environmental factors. Psoriasis can start at any age. It's most common between ages 30 and 39 and also between ages 50 and 69. Psoriasis affects nearly equal numbers of men and women. In people with this disease, the skin grows too fast. Dead skin cells build up on the skin’s surface to form inflamed, thick, silvery scales called plaques. Sometimes people form many small lesions that can hurt or have pus in them. Psoriasis does not spread from person to person.

About your symptoms

Psoriasis plaques tend to form on the elbows, knees, scalp, navel, arms, legs, and the penis or vulva. They can be unsightly, painful, and itchy. Plaques on the joints can limit movement. On the fingernails or toenails, psoriasis can cause pitting, a change in nail color, and a change in nail shape. In some cases, psoriasis also causes arthritis. Symptoms may come and go on their own. Factors such as stress, infection, and certain medicines may cause flare-ups. If symptoms bother you, many treatments are available to help ease symptoms. Discuss your treatment options with your healthcare provider.

Treatments for your skin

There are many types of medical medicines that can treat the affected skin lesions. Your healthcare provider may prescribe one of many types of medicines that are put on the skin. These include moisturizers, steroids, types of vitamin D, medicines made from vitamin A (retinoids), and other non-steroid medicines. You put them on your skin on a regular basis. Coal tar is a thick black liquid. You may put it on thick plaques. In some cases, your skin may be exposed to a special light in the healthcare provider's office. Or you can expose the psoriatic plaques to short periods (5 minutes) of natural sun as directed by your healthcare provider. This method is called phototherapy. It can be helped with a type of medicine called psoralen.

Treatments by mouth or by shot

Internal treatments are taken by mouth or given by shot (injection). A number of new oral and injectable medicines can treat severe psoriasis. Your healthcare provider can tell you more about these treatments.

Online Medical Reviewer: Michael Lehrer MD
Online Medical Reviewer: Raymond Kent Turley BSN MSN RN
Online Medical Reviewer: Ronald Karlin MD
Date Last Reviewed: 8/1/2019
© 2000-2019 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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