Psoriasis is a chronic autoimmune skin condition that causes inflammation and scaling of the skin. It occurs when the immune system mistakenly attacks healthy skin cells, causing them to grow too quickly and build up on the surface of the skin, leading to thick, scaly patches. The most common type of psoriasis is plaque psoriasis, which causes dry, itchy, raised skin patches covered with scales. Other types of psoriasis include nail psoriasis, guttate psoriasis, inverse psoriasis, and erythrodermic psoriasis. Psoriasis can affect people of any age, sex, or race, and it affects more than 3% of the U.S. population. While there is no cure for psoriasis, treatments such as topical creams, light therapy, and medications can help manage symptoms. People with psoriasis may also be at risk for developing psoriatic arthritis, a type of arthritis that affects some people with psoriasis. If you suspect that you may have psoriasis, it is important to see a healthcare provider for diagnosis and treatment.