Psoriasis is a chronic, multi-system, immune- mediated inflammatory disease which frequently involves the skin, nails and joints. When psoriasis affects the skin, it causes pink scaly rashes which may or may not itch. Any part of the body can be affected but it tends to involve the scalp, face, elbows and knees. Psoriasis may be aggravated by factors such as: alcohol, infection( eg flu), stress, physical trauma to the skin ( eg rubbing/ scratching), and certain medications such as beta-blockers and ACE inihibitors. The disease may begin during childhood or early adulthood. Individuals with psoriasis have a higher risk of developing diabetes, heart disease, obesity and inflammatory bowel disease.