Psoriasis is more than just a skin condition – it’s an autoimmune disorder that speeds up skin cell production, causing scales, redness, and inflammation. The Mayo Clinic calls it “a skin disease that causes a rash with itchy, scaly patches, most commonly on the knees, elbows, trunk and scalp.” It affects over 125 million people globally and 8 million in the U.S.

There are five main types. The National Psoriasis Foundation (NPF) says plaque psoriasis is the most common, with “dry, itchy, raised patches of skin (plaques)” covered in scales. Guttate psoriasis appears as “small, teardrop-shaped spots” after infections like strep throat. Inverse psoriasis causes “shiny, smooth, red patches” in skin folds, worsened by sweat and friction. Pustular psoriasis involves “blisters filled with pus” and can trigger fever or chills. Erythrodermic psoriasis is rare but severe, causing “intense redness and shedding of skin,” and requires immediate medical care.

Psoriasis can also affect nails, leading to “thickened, pitted, discolored” nails or detachment, signaling possible psoriatic arthritis. Though its cause is unclear, genetics and environment play key roles. If you notice any symptoms, consult a dermatologist to manage your health effectively.