Psoriasis is a common skin condition that causes red, flaky patches of skin and scales. Symptoms include thick red skin, irritation, and silvery-white scales. It occurs when the immune system mistakes healthy skin cells for pathogens and causes them to grow too quickly. Psoriasis has various forms from mild to severe and is most common in people ages 15-35. While there is no cure, treatments include topical creams, light therapy, and controlling triggers. Psoriasis is a lifelong condition but can be managed and does not typically impact overall health.