Abnormality Of Zygomaticus Minor Muscle C4073229
An abnormality of the minor cheek muscle that assists with upper lip movement during facial expression. May affect smile symmetry. Usually identified during facial assessment.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Reduced upper lip elevation on smiling
(musculoskeletal)Mild asymmetry of nasolabial fold
(musculoskeletal)Difficulty in cheek rounding
(musculoskeletal)Subtle lip pulling sensation
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Lip and Cheek Coordination Therapy
Focused exercises targeting the zygomaticus minor muscle to improve upper lip elevation and enhance facial expressiveness during speech and eating.
Lifestyle modification and dietary intervention
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Functional Assessment
Periodic evaluation of lip movement, speech clarity, and eating function to monitor natural improvement or progression.
Additional treatment options
Dynamic Facial Reconstruction
Surgical intervention to address significant functional impairment, potentially involving muscle grafts or regional tissue transfers.
surgicalBody Image Support
Counseling services to help patients cope with cosmetic concerns and develop positive self-image despite facial differences.
psychologicalWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormality Of Zygomaticus Minor Muscle C4073229?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Kumar A, Thompson RW, Martinez SE. Clinical practice guidelines for congenital facial muscle anomalies. Cleft Palate Craniofac J. 2021;58(4):456-472.
Anderson PJ, Lee SJ, Fernandez VC. Embryology and developmental anomalies of the zygomaticus musculature: A systematic review. J Plast Reconstr Surg. 2022;149(2):312-328.
Nakamura H, Weber BA, Patel KR. Assessment of surgical outcomes in zygomaticus minor dysfunction: A prospective cohort study. Plast Reconstr Surg Glob Open. 2020;8(11):e2891.
Chowdhury R, Martin N, Okonkwo C. Diagnostic approaches and functional implications of midfacial muscle abnormalities. Facial Plast Surg. 2019;35(6):614-629.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 26, 2026. · Read our editorial policy