Typically, psoriasis—a chronic, inflammatory skin condition—shows up as red patches that have a silver, scaly appearance. Pustular psoriasis is a little different, and can actually be quite serious. 

Pustular psoriasis is characterized by white pustules (or blisters of pus) surrounded by red skin, according to the National Psoriasis Foundation (NPF). But—and this is important—pustular psoriasis is not contagious.

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