I spotted a young woman in her 20's with obvious cosmetic facial reatments: I learned that it is called a bull horn lip lift

 You can easily spot plastic surgery from far away because it breaks natural human body patterns, such as unnatural symmetry, tight or shiny skin, and exaggerated shapes. You only notice the extreme or overdone cases, while subtle, well-done procedures go completely unseen.  

Visual Clues You Are Seeing

Odd Proportions: Shapes that do not match a person's age, body type, or ethnic background.
Stiff Movement: Faces or limbs that do not move naturally when a person talks or walks.
Reflective Skin: Skin that looks overly tight, smooth, or shiny because it lacks normal texture or pores.
Sharp Lines: Hard edges or sudden drops where fat or tissue was added or removed. [1, 2, 3]

Why Your Brain Catches It

Pattern Recognition: Human brains look for faces and bodies every day, so even a tiny change in symmetry or shadow stands out instantly.
The Bias of Extremes: You only spot the bad or loud jobs. Thousands of people walk past you with hidden work every day, but your brain only flags the ones that look unusual.