Facial assessment before aesthetic botulinum toxin treatment

Subject classification: this is a medicine resource.

Medical disclaimer: This page is for educational and informational purposes only and may not be construed as medical advice. The information is not intended to replace medical advice offered by physicians. Please refer to the full text of the Wikiversity medical disclaimer.

Facial assessment before aesthetic botulinum toxin treatment is an open learning resource about structured pre-treatment assessment in facial aesthetic practice. It focuses on clinical reasoning before treatment rather than on injection coordinates, fixed dosing recipes, or product-conversion rules. The central principle is that aesthetic botulinum neurotoxin type A (BoNT-A) treatment should follow an individualized assessment of the person, the face at rest and in motion, interacting facial muscle groups, baseline asymmetries, treatment goals, and relevant risk factors.

This resource is intended for advanced learners and healthcare professionals studying facial aesthetics. It does not replace supervised clinical training, local regulation, current product labeling, informed consent, or individualized professional judgment.

Learning objectives

After working through this resource, a learner should be able to:

• distinguish a facial assessment from a simple wrinkle count;
• explain why observation at both rest and animation matters;
• recognize that muscles act as an interacting system rather than isolated targets;
• identify baseline features that may influence aesthetic interpretation, including brow position, eyelid characteristics, facial asymmetry, soft-tissue support, and habitual compensatory activity;
• structure a patient-centered history around goals, prior treatments, prior adverse effects, and expectations;
• explain why standardized photographs, expressions, and documentation are useful before treatment;
• identify circumstances in which treatment should be deferred pending further evaluation, clarification, or referral;
• separate assessment principles from product-specific dosing and injection technique.

1. Start with the person, not an injection map

Aesthetic assessment begins by clarifying what the person is seeking to change and why. A line that is visually prominent to a clinician may not be the patient's principal concern, while a subtler feature may be highly important to that patient. Consensus work in facial aesthetics emphasizes patient-centered goals, realistic expectations, and an individualized treatment journey rather than a standardized procedural template.

A useful opening assessment explores:

• the patient's own description of the concern;
• whether the goal is softening movement, changing a line visible at rest, altering a contour, or changing how an expression is perceived;
• the degree of movement the patient wishes to retain;
• prior aesthetic procedures and whether previous results were satisfactory;
• prior unexpected weakness, asymmetry, eyelid or brow change, smile change, swallowing difficulty, or other adverse effects;
• time course of prior BoNT-A exposure and, where known, the product used;
• expectations about onset, duration, symmetry, and the possibility that one modality may not address every component of the concern.

The consultation should also make room for psychosocial context. Body dysmorphic disorder (BDD) is relevant to aesthetic settings, and validated screening instruments exist; however, screening is not the same as making a psychiatric diagnosis. The purpose of recognizing concerning patterns is to improve patient selection and support appropriate referral rather than to label a patient casually.

2. Review medical context and treatment suitability

Pre-treatment assessment should include a relevant medical and medication history. Exact contraindications and warnings differ by product and jurisdiction, so the current locally approved prescribing information should be consulted rather than relying on a generic checklist.

Areas commonly reviewed before aesthetic BoNT-A treatment include:

• previous hypersensitivity or adverse reaction to a botulinum toxin preparation or formulation component;
• infection or active inflammatory process at a proposed treatment site;
• known neuromuscular disease or symptoms suggesting impaired neuromuscular transmission;
• medicines that may alter neuromuscular transmission, and medicines or supplements relevant to bleeding or bruising risk;
• previous facial surgery, trauma, nerve injury, facial palsy, synkinesis, or other conditions that alter baseline movement;
• pregnancy or lactation, with decisions guided by current evidence, product labeling, local rules, and clinical context rather than assumptions;
• previous treatment elsewhere when product, dose, timing, or injected areas are uncertain.

A recent review of upper-face botulinum toxin practice reiterates that patient evaluation and selection are critical and that understanding anatomy is central to complication prevention.

3. Observe the face at rest first

Assessment at rest establishes the baseline against which dynamic change will be interpreted. Important observations include:

• brow height, shape, and right-left difference;
• upper-eyelid show, dermatochalasis, and apparent or true eyelid/brow ptosis;
• forehead line pattern and whether lines are visible without active frontalis contraction;
• glabellar line depth at rest;
• periorbital line pattern and lower-eyelid position;
• nasal, perioral, chin, jawline, and platysmal asymmetries where those regions are relevant;
• facial proportions, soft-tissue volume, skin quality, and skeletal support that may contribute to a static appearance not primarily driven by muscle activity.

The purpose is not to classify every minor asymmetry as abnormal. Normal faces are asymmetric. The practical question is whether an asymmetry is likely to affect treatment planning, expectation-setting, or interpretation of the result.

4. Reassess during standardized animation

Static inspection alone cannot reveal how the facial muscle system behaves. Multiple consensus publications recommend evaluating the face both at rest and during animation.

Depending on the area being studied, standardized movements may include:

• maximal eyebrow elevation;
• frowning or drawing the brows medially;
• gentle and maximal eye closure;
• spontaneous and posed smiling;
• nasal scrunching;
• lip pursing and other perioral movements;
• chin contraction;
• jaw clenching when masseter activity is relevant;
• platysmal activation when lower-face or neck dynamics are relevant.

The learner should watch for sequence, strength, recruitment, compensation, and asymmetry, not just the final wrinkle pattern. Repeating the same expression can help distinguish a reproducible movement pattern from a transient or poorly understood instruction.

5. Think in functional muscle groups

Facial muscles interact mechanically and visually. Weakening one component can change the relative dominance of another. This is particularly important in the upper face, where brow position reflects the balance between the frontalis and brow-depressing muscle groups. An integrative assessment of the forehead, glabella, brow, and eyelids therefore provides more information than treating each region as an isolated rectangle.

Questions for the upper face include:

• Is the frontalis contributing to habitual compensation for a low brow or upper-eyelid heaviness?
• Is frontalis recruitment symmetric?
• Does one brow elevate earlier or farther than the other?
• Is the patient's desired brow shape compatible with baseline anatomy and muscle recruitment?
• Are glabellar lines primarily dynamic, or is there a substantial static component?
• Does maximal smiling change lower-eyelid or lateral canthal behavior in a way that should be documented?

The same relational principle applies beyond the upper face. Lower-face movement involves multiple elevators, depressors, sphincters, and stabilizers with roles in expression and oral competence. Lower-face treatment is generally considered more anatomically demanding and should not be reduced to isolated line chasing.

6. Identify compensation before modifying it

A muscle can be active because it is the primary source of an unwanted expression, because it is compensating for another structural or functional feature, or both. Examples include:

• persistent frontalis activity helping maintain brow position;
• asymmetric frontalis recruitment compensating for baseline brow asymmetry;
• altered smile mechanics after dental, neurologic, surgical, or traumatic change;
• asymmetric lower-face recruitment associated with previous facial nerve dysfunction;
• platysmal or chin recruitment that becomes more visible when another movement pattern changes.

A pre-treatment record should distinguish what is visible before treatment from what emerges after the balance of forces changes.

7. Separate dynamic and static components

BoNT-A changes neuromuscular activity; it does not directly restore lost volume, alter bone structure, or erase every static crease. The relative contributions of movement, skin quality, soft-tissue volume, ligamentous support, and skeletal anatomy should therefore be considered before deciding what a realistic outcome would look like.

This distinction supports more accurate counseling:

• a predominantly dynamic line may change differently from a deeply etched static line;
• a contour concern may involve volume or structural factors in addition to muscle activity;
• a perceived asymmetry may persist because it is partly skeletal or soft-tissue based;
• the optimal endpoint may be controlled movement rather than maximal immobility.

8. Use standardized documentation

Good baseline documentation improves communication, follow-up comparison, and interpretation of unexpected outcomes. With appropriate consent and privacy safeguards, standardized photography can include:

• frontal face at rest;
• oblique or lateral views when relevant;
• standardized maximal expressions corresponding to the regions being assessed;
• consistent camera distance, head position, lighting, and facial instruction when feasible.

Clinical notes can record:

• principal patient goals in the patient's own words;
• relevant history and previous treatment experience;
• baseline asymmetries;
• key findings at rest and in motion;
• discussion of limitations and alternatives;
• the agreed treatment objective rather than only the planned procedure.

9. A compact pre-treatment assessment framework

The following mnemonic is a learning aid, not a validated clinical instrument.

Domain	Questions
G — Goals	What does the patient want to change? What movement do they want to preserve?
H — History	Previous BoNT-A, adverse effects, surgery, neurologic history, medications, relevant health context?
R — Rest	Baseline brow, eyelid, lines, asymmetry, skin/soft-tissue/skeletal context?
A — Animation	What changes with standardized expression? Which muscles recruit, compensate, or differ side to side?
P — Proportions and relationships	How do adjacent regions and opposing muscle groups interact?
H — Harm reduction	Are there reasons to defer, seek more information, refer, or use a different strategy?
D — Documentation	Are goals, photographs, asymmetries, consent discussion, and baseline findings recorded?

10. Worked reasoning examples

These examples illustrate assessment logic only and intentionally omit injection points and doses.

Example A: forehead lines with low resting brow

A patient requests complete removal of forehead movement. At rest, the brow sits relatively low and the frontalis is mildly active even before the patient is asked to raise the eyebrows. During animation, frontalis recruitment is strong and appears to contribute to maintaining brow position.

Learning point: the forehead should not be interpreted in isolation. Baseline brow position, eyelid characteristics, and compensatory frontalis activity should be documented and discussed before any decision about modifying movement.

Example B: asymmetric glabellar recruitment

At rest, the brows are mildly asymmetric. During frowning, one side recruits earlier and more strongly. The patient had not noticed the asymmetry before the consultation.

Learning point: documenting pre-existing asymmetry is essential. Symmetry of treatment does not necessarily mean identical treatment of inherently asymmetric anatomy, and a post-treatment difference should be interpreted against the pre-treatment baseline.

Example C: dissatisfaction with a previous “frozen” result

A patient reports that a previous treatment reduced lines but made facial expression feel unnatural. Their new goal is softer movement rather than maximal line elimination.

Learning point: outcome quality is partly defined by the patient's goal. A technically visible reduction in movement is not automatically equivalent to patient satisfaction.

11. What this resource deliberately does not provide

This learning resource does not provide:

• fixed injection coordinates;
• universal doses;
• conversion ratios between BoNT-A products;
• instructions for unlicensed practice;
• a substitute for anatomy training, supervised procedural education, or product-specific prescribing information.

Different BoNT-A preparations are not simply interchangeable by a universal unit-conversion rule, and published consensus recommendations repeatedly emphasize individualized anatomy and product-specific practice.

12. Self-assessment questions

1. Why can strong resting frontalis activity be clinically meaningful before aesthetic treatment?
2. What information is added by observing a face during animation rather than only at rest?
3. Give three examples of baseline asymmetry that should be documented.
4. Why should a static etched line not automatically be interpreted as a pure muscle-activity problem?
5. What is the difference between BDD screening and diagnosing BDD?
6. Why is a patient goal such as “retain natural movement” clinically relevant to assessment?
7. Why should product-specific contraindications and warnings be checked in current local labeling?

13. Suggested learning activity

Using standardized, consented photographs or a teaching model, create a one-page assessment note containing:

1. the stated aesthetic goal;
2. observations at rest;
3. observations during two or more standardized expressions;
4. a description of any right-left difference;
5. an explanation of at least one interacting muscle relationship;
6. one factor that could limit the expected result;
7. one reason treatment might need to be deferred or additional information obtained.

The exercise is complete when another learner can understand the baseline facial pattern without being told an injection plan.

Evidence overview

The assessment model in this resource is consistent with recurring themes across consensus statements and reviews: individualized treatment, evaluation at rest and animation, attention to functional anatomy and interacting muscle groups, patient-centered goals, and structured follow-up. A 2026 systematic review of upper-face aesthetic BoNT-A studies also reported substantial heterogeneity across clinical outcomes and emphasized the need for stronger evidence-driven standardization of outcome assessment.

Related learning resources

• Botulinum toxin in aesthetic medicine
• School:Medicine
• Wikiversity:Medical disclaimer

Author and provenance

This resource was developed by Saeed Ghezelbash as an openly licensed Wikiversity learning resource. It synthesizes published literature for educational use and is intended to remain open to collaborative improvement. The author attribution describes contribution to this learning resource and does not imply that Wikiversity endorses any individual, clinic, product, or treatment approach.