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Psoriasis—a chronic, inflammatory skin condition—affects more than eight million people in the U.S. alone. From there, things get a little trickier. There are actually five different types of psoriasis, according to the National Psoriasis Foundation (NPF): plaque, guttate, inverse, pustular, and erythrodermic.
Of all the five types, guttate psoriasis is a bit less common than others. “While psoriasis affects between two to four percent of the population, guttate psoriasis comprises only a small percentage of those patients,” says says Bobbak Mansouri, MD, a board-certified dermatologist in Tyler, Texas.
In addition to its rarity, guttate psoriasis is considered a “reactive psoriasis,” says Erum Ilyas, MD, a board certified dermatologist in King of Prussia, Pennsylvania. That means “it’s often triggered by an immune system reaction to a viral or bacterial infection,” she says. Here’s everything else you need to know about guttate psoriasis, and the treatment options available.