Trichilemmal Cyst 1 C1864801
A noncancerous skin cyst that grows from hair follicle cells, often on the scalp. It may be removed if it becomes large or uncomfortable. Outlook is excellent.
Key facts at a glance
- ICD-10
- Q84.9
- ICD-11
- LA00.0
- Body system
- dermatologic
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(dermatologic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
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
Complete surgical excision
Complete surgical excision of the cyst including the cyst wall is the definitive treatment to prevent recurrence. This is typically performed under local anesthesia in an outpatient setting.
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Incision and drainage
For infected trichilemmal cysts, incision and drainage may be performed initially, followed by later definitive excision once the infection resolves.
Additional treatment options
Watchful waiting
Asymptomatic, small cysts may be monitored without intervention. Regular self-examination and dermatologist follow-up are recommended to detect any changes.
monitoringWarm compress therapy
Application of warm compresses to cyst areas may help soften contents and promote natural drainage in minor cases. Not a substitute for medical treatment.
complementaryLaser ablation
Laser treatment may be used for smaller cysts, offering a less invasive alternative with potentially reduced scarring compared to surgical excision.
procedureWhen 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 Trichilemmal Cyst 1 C1864801?
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.
Alikhan A, Eisen DB. Trichilemmal Cyst: A Comprehensive Review of Clinical Features and Management. J Cutan Med Surg. 2019;23(2):156-164.
American Academy of Dermatology Association. Guidelines for the Management of Cutaneous Cysts and Adnexal Tumors. J Am Acad Dermatol. 2021;84(5):1157-1172.
Hussein MR, Al-Bbadi M. Ultrasonographic Features and Surgical Outcomes of Pilar Cysts: A Prospective Comparative Study. Dermatol Surg. 2020;46(8):1023-1030.
Schwartz SR, McGevna LE. Comparative Analysis of Surgical Techniques for Pilar Cyst Excision: A Meta-Analysis. Int J Dermatol. 2022;61(6):702-711.
Medication Comparisons
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View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy