One severe form of psoriasis causes the entire body to become covered in rashes. This form, erythrodermic psoriasis, often resembles a severe sunburn. Unlike other psoriasis lesions, the large rashes shed in sheets rather than scales. Additionally, this type can affect a person’s overall body chemistry. Many people experience extreme body temperature fluctuations, leading to fluid retention and swelling, especially in the ankles. Pneumonia or heart failure are also possible. Triggers for erythrodermic psoriasis include infections, sunburns, and allergic reactions.

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