Have you ever wondered about a friend who suddenly looks years younger or a celebrity on the red carpet with beautiful skin? Dr. Anthony Youn dishes on national TV the best ways to spot the telltale signs of cosmetic surgery. Learn what to look for - and what you want your cosmetic surgeon to avoid - when investigating aesthetic procedures.

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The biggest give away of cosmetic surgery is the scar. Often, when patients undergo a facelift, there will be a small scar just by the ear where the surgeon has made his incisions. Though the scar is often disguised as a fold front of the ear, a trained eye can spot this telltale sign of a facelift. Some physicians use a method that places the scar inside the ear to avoid this surgery giveaway, but few doctors opt for this option.

Dr. Youn says an easy way to spot a lip augmentation is by the size of the lower lip compared to the upper. "A lower lip should be one and a half times the size of the upper lip," Dr. Youn says. "When doctors actually make the upper lip too big, it looks somewhat unnatural because those natural proportions aren't balanced."

Another popular cosmetic procedure Dr. Youn didn't mention is breast augmentation, which also comes with scarring. Incisions for this surgery vary and can go under the breast or around the nipple. Other more hidden options include inside the naval or in the armpit, so it can be very difficult to tell whether or not someone has had breast implants placed. Of course, if your A-cup friend spent a couple of weeks away and came back with a tan and a D-cup bra, you might be able to assume she had some work done.