The Art of the Upper Face: A Map Beyond the Needle
Let me tell you about the most challenging muscle you will ever try to treat in aesthetics—the frontalis. It is not a simple pattern you can copy from one patient to the next. That is a recipe for frustration and, worse, for side effects. Every forehead is a unique landscape. You must learn a set of principles that allow you to treat any forehead, not a single injection pattern that someone tells you will work on everyone. Because it simply never will.
Why is this area so prone to complications? Because the frontalis is highly variable. And when you aim for different outcomes—say, a more masculine treatment pattern that leaves no lines, but drops a female patient's eyebrows—that is a side effect they will call brow ptosis. The key insight is that we are almost always trying to partially treat the frontalis. Very few people require complete obliteration of the entire muscle. Some movement must remain to support the eyebrows. Over treat the middle, and you get a medial brow ptosis with a lateral brow lift—that classic Spock brow. Over treat laterally, and you lose the arch of the eyebrow while the middle keeps moving, creating a sad, droopy look. Over treat the whole thing, and the patient looks tired, their eyebrows settled, and if they have skin that rolls from the forehead onto the eyelids, you can create a bilateral brow ptosis that looks like a lid issue even though it is not.
All these aesthetic complications stem from a blanket approach—using too much toxin on everyone or the same injection pattern on everyone. To avoid these, you must understand the underlying muscle. My best tip for treating the frontalis is this: start by assessing each patient individually. And the easiest way not to mess up is to first decide where not to inject. Draw a safety margin about 2 cm from the orbital rim to prevent brow ptosis. Then decide where it would be a waste—if there is an aponeurosis and no muscle visible, do not waste your toxin there. By the time you have mapped out all the areas you want to avoid, the area where you actually want to inject becomes small and manageable. That makes everything easier.
The Corrugator: The Next Key Player
Once you have handled the horizontal forehead lines, the next most important muscle in the upper face is the corrugator supercilii—the muscle that creates the "11" lines between the brows. It runs from the periosteum medially, through all the different layers and fat pads, and touches the dermis at the far lateral point. Understanding that root path directly informs how you inject. You inject deeper medially, and then gradually become more superficial as you approach the lateral part of the brow. This minimizes side effects and maximizes product efficiency. Why? Because injecting the corrugator is responsible for most cases of ptosis. As you move laterally, you get closer to the supraorbital foramen, where an artery and nerve run. If you place toxin near that point, you risk relaxing the levator palpebrae muscle—the eyelid lifter—and causing ptosis. The beauty of knowing the anatomy is that as you get closer to that high-risk area, you can inject more superficially. You still get a great result, but you have a fat pad between you and that foramen, reducing the chance of ptosis.
The Procerus: A Muscle of Surprise
The last major muscle in the upper face is the procerus, the thin muscle at the bridge of the nose that pulls the glabella down toward the nose. The main thing to know about the procerus is that it is hugely variable. Do not get into the habit of injecting the same number of units every time. Unless it is the same patient, you are likely wasting product or undertreating. Sometimes it is so small it is essentially absent—you cannot see any downward movement. In a small percentage of patients, it is the dominant muscle. You will see a distinct crease over the top of the nose from a complete downward pull, with very little corrugator action. Those patients need a different focus: you might put 12 units in the procerus and very little in the corrugator. You have to identify that at the beginning.
The Orbicularis Oculi: A Circular Dilemma
Now, let's talk about the muscle that causes crow's feet—the orbicularis oculi. It is a circular muscle running very close to the surface around the eye, and it is complex because of the multiple vectors involved. At different points, it pulls in different directions. If you are only treating lateral canthal lines, you can get by without knowing too much. But with experience, you will notice nuances. In a small percentage of patients, relaxing the lateral lines causes a medial pull. The vector is neutralized, and now the patient's smile creates a strong medial squeeze. Chasing those lines with more toxin can make it worse, leading to an unnatural look. Sometimes you need to use less toxin and find another approach, like dermal filler or other modalities.
The orbicularis oculi is also in a tug-of-war with the frontalis muscle. The frontalis pulls up, the orbicularis oculi pulls down. If you relax the orbicularis oculi, you get a subtle eyebrow lift. That can even be used to treat a brow ptosis caused by over-treating the frontalis. But the orbicularis oculi also helps elevate the cheek during a genuine smile—the Duchenne smile. Our brains can tell a real smile from a fake one. If you over treat the orbicularis oculi, the smile becomes flat, and the cheek moves less. In older patients, the muscles are holding everything together. Over treat to get rid of lines, and the lower face can actually drop, making them look older. You have to be careful.
My best tip for the orbicularis oculi: inject more superficially. Most of us from clinical medicine feel we are not injecting properly unless the needle is at least halfway in. That is far too deep for this muscle. You can inject with barely a millimeter and a half, sitting just on top of the muscle. That minimizes bruising and keeps the muscle as a shield for what lies underneath. One of the worst side effects from toxin is affecting the zygomatic muscles, which can cause an asymmetrical smile that looks like a stroke. That comes from injecting too deeply. In 12 years, I have never had a case, but I have seen it—and it is devastating for patients because every time they are happy, someone asks, "What's wrong?" Injecting superficially and not going too inferior should completely remove that risk. It is mostly about depth.