Psoriasis can begin as early as age 60 and is often associated with other conditions such as obesity, type 2 diabetes, hypertriglyceridemia and cardiovascular disease. Psoriasis is a skin condition in which the surface layers of skin rapidly build up cells to form thick, tough patches that could resemble scales. Psoriasis is a chronic condition as the symptoms can be persistent. According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases, psoriasis begins with the immune system. T cells, which are a kind of white blood cell, are activated by mistake. Under normal conditions, they're only activated when there's a threat to the immune system. When they act erratically, the skin cells begin to die and reproduce at a rapid rate, causing the tissue to pile up on top of itself in the form of scales.