← Ettie Hauss Medical aesthetics · Training

Where would you inject?

A client tells you what she wants. You place the points, and the face tells you what you actually hit — the muscle, the millimetres, and the complication you just bought. Plus the other half of the job: the arteries you cannot see.

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Training reference for licensed injectors. Doses are onabotulinumtoxinA unless stated, and units are never interchangeable between products. Nothing here replaces supervised hands-on training, your own jurisdiction's scope of practice, or the prescribing information. Several areas covered are off-label.

The consultation

Client

Your assessment

How this works
  1. Read the brief above. The client tells you an outcome, not a treatment. Work out which muscles produce it.
  2. Click the face to place a point. Click a point again to remove it. The counter under the face tracks how many you have placed.
  3. Evaluate. Every point is tested against the target zones, the hazard zones, and the muscle underneath — so a miss tells you what you hit and what it produces.

Stuck? Turn on Landmarks under the face for the orbital rim and the two safety floors, or Muscles to see what is under the skin. Both are hidden by default because reading a face is the skill.

The problem

Injector training is a slide of a face with dots on it.

You memorise five points for the glabella and three for the crow's feet, you pass the written, and then someone real is in the chair asking for something the diagram never covered — a brow lift, which is not a place on a face but an argument between muscles.

What the slides skip is the part that actually goes wrong: the millimetres. Two centimetres above the brow and you have a happy patient; one centimetre and you have taken away the only muscle that lifts her eyebrow, for four months, with no rescue. The dot looks the same on the slide.

The build

The face is measured, not drawn

Everything sits on a real coordinate grid where one centimetre is a fixed distance — orbital rim, brow line, canthi, tragus, mandibular angle. So the safety rules are enforced geometrically rather than described. Turn on the landmark layer and you can see the lines you are being held to.

It tells you what you hit

Every point you place is tested against the target zones, the hazard zones, and the muscle map underneath. Miss and it names the muscle you landed in and what that produces — lip droop from zygomaticus, diplopia from lateral rectus, an asymmetric smile from risorius.

One case has no right answer

The patient with deep forehead lines who cannot stop raising her eyebrows is holding her brows up with her frontalis all day. Treat what she is asking for and you narrow her visual field for four months. The correct answer is a conversation and a referral, and the case is built so you can get it wrong first.

Filler is a different fear

Toxin mistakes are temporary. Filler in an artery is not. The danger-zone half maps the vessels against the zones, ranked by the two catastrophes separately — because blindness and necrosis do not rank the same way, and most curricula teach only one order.

Built from BOTOX Cosmetic, Dysport, Xeomin and Jeuveau prescribing information · StatPearls upper-face and muscle-specific reviews · Beleznay et al., Aesthetic Surgery Journal 2024, 511 cumulative blindness cases · Rohrich, Facial Danger Zones · International (Speywood) consensus on abobotulinumtoxinA · Zhang et al. 2023 RCT on the Yonsei point · Yi et al. 2023 on DAO localisation · Janis et al. on corrugator anatomy · JCAD on ptosis management · IJDVL botulinum toxin guidelines · CMAC guidance on vascular occlusion.