With psoriasis, an immune system problem causes skin changes. The symptoms involve an itchy, sometimes painful rash that is much different than the one caused by shingles. There are many subtypes ...

It’s also hard to pinpoint exactly why someone gets psoriasis. As with other autoimmune diseases, it’s probably a combination of the genes you’re born with and things in the world around you ...

Like psoriasis, parapsoriasis shows up as a patchy rash. Spots are usually pink or red but also can appear brown or yellowish. They can be raised and bumpy with a scaly or wrinkly appearance.

Psoriasis can easily be mistaken for other difficult-to-deal-with skin problems, like a bad infection or rash, eczema, or dermatitis. And because it varies in severity, it can be tricky to figure ...