Liposuction

First, and foremost, combination surgeries can only be done on patients who are medically healthy. Once this is established certain surgeries can make a lot of sense to combine. This is due to the ability to benefit from one recovery instead of several, and for the financial savings. The cost of splitting the procedures is higher due to paying for anesthesia and operating room fees twice.

The most common combination procedure is any breast surgery with a tummy tuck. This combination is called a "Mommy Makeover" and is designed to restore a woman's figure back to her pre-childbirth state. Breast surgeries here are customized to what's needed, and can range from breast implants, to lifts, to reductions. The tummy tuck removes the extra skin and stretch marks, as well as tightening the abdominal muscles beneath. Patients should plan on taking ten days to two weeks off from work while recovering from this procedure.

This is a really common question whose answer depends on several factors.

Firstly, most Plastic Surgeons won't offer an abdominoplasty (tummy-tuck) to women who want to have children in the near future. This is because the extra skin allows the abdomen to stretch during the next pregnancy. If it's removed during an abdominoplasty further stretch marks might appear from the pregnancy that would have been prevented if the patient waited until her child bearing was over.

Secondly, the age of the patient and the skin's snappiness will also affect the surgeon's decision. This is because the skin's ability to shrink to the new size after liposuction is dependant on its tone. Older skin, or skin with poor tone, will not shrink in size after liposuction. In these instances its better to surgically remove the excess skin with a tummy-tuck to give the skin a tightened appearance.

As always the doctor performing these procedures should be a board certified Plastic Surgeon, and the patient's medical condition should be evaluated prior to surgery.

Arm lifts are called brachioplasties (doctors have a different word for everything!)
 
Think of this surgery as a tailor thinks about taking in a dress, or suit.  The material is the skin, therefore the more extra material (skin) there is, the longer the scar (or seam) is.  The Plastic Surgeon's job is to assess how much the skin will shrink with liposuction versus having to surgically remove skin.  Based on that assessment the surgeon will offer the appropriate procedure.
 
In a patient with excellent skin tone liposuction can be performed alone.  As skin tone diminishes skin needs to be removed, resulting in scarring.  If only a minimal skin resection is planned the scar can be hid in the arm pit.  If more skin needs to be removed the arm pit scar can be extended slightly down the inside part of the upper arm.  When a full brachioplasty is offered the scar travels down the inside of the upper arm to the elbow.  Although this is a long scar it's only offered to patients who otherwise wouldn't get the cosmetic result desired with any of the smaller procedures.  This group very often includes bariatric (massive weight loss) patients.
 
With all of these, tailoring, surgeries every effort is made to make the scar as inconspicuous as possible.  This is done by using fine technique and by hiding them on the inside of the arm.