Psoriasis is a chronic autoimmune condition characterized by the rapid overproduction of skin cells, leading to the formation of thick, red, and often scaly patches on the skin. These patches, known as plaques, can appear anywhere on the body but are commonly found on the elbows, knees, scalp, and lower back.

While the exact cause of psoriasis is not fully understood, it is believed to involve a combination of genetic, environmental, and immune system factors. Triggers such as stress, infections, certain medications, and changes in weather can exacerbate symptoms.