Before answering your question, we need to know a few things: 1) How long have you noticed this? 2) Has it worsened over time? 3) Is it present at rest (no facial expression) or only during active smiling? 4) Have you ever had any procedures of surgery to the lip or surrounding areas, including botox, fillers, fat grafting, lip lift, lift augmentation, chemical peels, rhinoplasty? Once those questions are answered, we can provide a more complete answer to your problem. With that being said, the treatment for a deep horizontal upper lip crease such as this may include a range of procedures including botox (to relax overactive muscles that pull in a vertical direction), filler or fat grafting (to soften/fill the deep horizontal crease), or a surgical lip lift (to remove excess upper lip skin). Hope this helps, Blake Raggio, MD