Psoriasis is usually a long-term problem. Symptoms tend to come and go in a cycle of flares, when symptoms get worse, and remission, when symptoms improve and go away for awhile. In other cases psoriasis may persist for long periods of time without getting better or worse.
Several things can make
symptoms worse, depending on the
type of psoriasis. These factors, or triggers, include:
- Dry climates.
- Skin injury.
- Certain medicines.
A few cases of psoriasis may go away without treatment. But it's usually best to treat psoriasis so that it doesn't get worse. If it becomes severe and widespread, it may be much harder to treat.
Mild, moderate, and severe psoriasis
The severity of
psoriasis is indicated by the amount of redness and scaling, the thickness of
the large areas of raised skin patches (plaques), and the percentage of your
skin that is affected.
- Plaques cover a
small portion of the body, such as the elbows or knees.
- Plaques cover several large areas. For example,
most of the scalp may be affected.
- Plaques may cover up to 20%
of the skin (about equal to having both arms completely
- Any joint pain is mild, but not
- Plaques tend to be visible to other
When severe, psoriasis can be:
- On the
- Plaques that may cover large areas (20% to 30%)
of the body. When determining the percent of coverage, consider that the palm
of your hand equals about 1% of your body surface, and the total surface of
both arms equals about 20%.
- Pustular psoriasis with large, fluid-filled plaque and
- Erythrodermic psoriasis with severe inflammation and
shedding (sloughing) of the skin.
- Psoriatic arthritis,
which includes ongoing joint swelling, tenderness, limitation of range of
motion, or joint warmth or redness. Severe cases can result in joint
Learn more about the different types of psoriasis.
Adam Husney, MD - Family Medicine
Amy McMichael, MD - Dermatology
January 9, 2012
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