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GlossaryTrichilemmal Cysts

non-cancerous, keratin-filled lumps typically found on the scalp

Trichilemmal cysts, also known as pilar cysts, are non-cancerous, fluid-filled lumps that typically develop on the scalp. They originate from the outer root sheath of hair follicles and are filled with keratin, a protein found in hair, skin, and nails. These cysts are usually firm, smooth, and can sometimes be hereditary.

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research Malignant Appearance of Trichilemmal Cyst: A Case Report With Review of the Literature

November 2023 in “International surgery journal”

A man's neck lump was a trichilemmal cyst, not cancer, and should be fully removed due to rare risk of becoming malignant.

research A Case Report of Kaphaja Granthi with Special Reference to Trichilemmal Cyst

September 2025 in “Journal of Ayurveda and Integrated Medical Sciences”

Surgery and Ayurvedic treatments together effectively healed a scalp cyst without relapse.

research Trichilemmal Cyst of the Neck: Case Report and Review of the Literature

1 citations , August 2021

A young girl had a rare neck cyst removed and needs careful monitoring for related health issues.

research Baricitinib-Induced Trichilemmal Cyst Reactivation in a Woman With Alopecia Areata

April 2025 in “Cutis”

Baricitinib may reactivate trichilemmal cysts in people with a history of these cysts.

research Osseous Metaplasia and Mature Bone Formation With Extramedullary Hematopoiesis in Trichilemmal Cyst

3 citations , March 2013 in “American Journal of Dermatopathology”

Ossification in trichilemmal cysts is more common than previously believed.

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community Go bald/buzzed, fellas. Your life will improve.

in Chat 227 upvotes 6 months ago

Buzzing or shaving your head can boost confidence and save money on hair loss treatments. Some prefer treatments like finasteride and minoxidil to maintain their hair.