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:
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%.