This type is the least common, but it's very serious. It affects most of your body and causes widespread, fiery skin that appears burned. You might also have:
Severe itching, burning, or peeling
A faster heart rate
Changes in body temperature
If you have these symptoms, see your doctor right away. You may need to get treated in a hospital. This type of psoriasis can cause severe illness from protein and fluid loss. You may also develop an infection, pneumonia, or congestive heart failure.
Triggers include:
Suddenly stopping your systemic psoriasis treatment
An allergic drug reaction
Severe sunburn
Infection
Medications such as lithium, anti-malarial drugs, cortisone, or strong coal tar products
Erythrodermic psoriasis may also happen if your psoriasis is hard to control.