Lip lines also known as lipstick lines or smoker lines, are due to repeated contraction of the circular muscle around the mouth. These vertical lines are where lipstick can bleed and can be worsened by smoking or straw use. They are easily treated with small amounts of Botox injected into the lip to relax the muscle. Typically, 2-8 units are injected. If the lines are very deep, a filler will also be required to smooth them.