I would really like to get a lip lift. What is the difference in risk and healing time when the muscle is hemmed?

There are several types of lip lift; corner lip lifts, internal lifts, and the most common, the upper lip lift, with or without volume expansion by various methods.  The treatment of the underlying structures are also important.  This is a very artistic procedure, and also a very technical one, so make sure you consult with careful surgeons who have your best interest in mind.  This is one operation that cannot be 'undone', so choose wisely.

The ideal candidate for the Elelyft, or upper lip lift, is someone with a philtral length of 14mm or longer, no upper dental show, and/or a thin upper lip. The nasal base to mouth width ratio needs to be taken into consideration to avoid leaving the lip corners down. 
The muscle is typically not touched, as to not disrupt normal function of the lips. After the skin is removed, specialized undermining is employed to reduce tension on the closure. 
Postoperatively, after a lip lift, you can anticipate bruising and swelling that will be noticeable to you and others for about 1 week. After the sutures are removed or dissolve, depending on the type used, there will be redness along the incision line for 4-6 weeks but this can be covered with makeup after about 10 days. Sometimes the upper lip lift is overcorrected with the initial procedure and will slowly assume its final position over weeks to months. 
Consult with an experienced lip surgeon for a complete range of options that are appropriate for your situation.
Gary Linkov, MD
Lip Specialist

A lip lift does 4 things: shortens the distance between your nose and upper lip, increases the mucosa of the upper lip, increases the incisor show and pulls up the corners.  A lip lift does not involve cutting the muscle or hemming it as you have described.  The wound is closed in layers.  Deep sutures, which last about 6 months and sometimes superficial sutures are needed as well but not always.  The sutures last until the wound has healed to minimize the scarring.Best Wishes,Gary Horndeski, M.D.