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What Is a Caruncle?

The lacrimal caruncle is a small pink mound in the nasal corner of the eye next to the plica semilunaris. Unlike nearby conjunctiva, it contains skin like elements including hair follicles, sweat glands, and oil glands. This mixed tissue helps trap debris and contributes to the tear film. It is a normal anatomical feature in the medial canthus.

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What Is a Caruncle?

The lacrimal caruncle is a small pink mound in the nasal corner of the eye next to the plica semilunaris. Unlike nearby conjunctiva, it contains skin like elements including hair follicles, sweat glands, and oil glands. This mixed tissue helps trap debris and contributes to the tear film. It is a normal anatomical feature in the medial canthus.

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What Sits Beside the Caruncle?

The plica semilunaris is a crescent fold of conjunctiva that allows free eye movement toward the nose. Together with the caruncle, it forms the medial canthal area where tears converge. Small vessels and glands populate this zone. The arrangement supports drainage toward the puncta.

Medial Anatomy

The plica semilunaris and caruncle occupy the nasal corner of the palpebral fissure. The plica is a vestigial remnant of the nictitating membrane found in other species. Its elastic tissue enables unrestricted ocular rotation. The caruncle contains sebaceous glands, hair follicles, and accessory lacrimal tissue that support lubrication.

Why Is A Caruncle Is Important for Vision

The caruncle, located in the inner corner of the eye, helps trap debris and supports tear drainage. Though small, it contributes to eye hygiene and comfort for maintaining clear sight.

Understanding the anatomy of the eye helps explain how vision works and why each part is important for healthy sight. From the cornea that focuses light to the retina that captures images, every structure plays a precise role. Learning about these components encourages better eye care and awareness of changes that could signal a problem.

What Does the Caruncle Do?

It contributes oils and mucus that help stabilize the tear film at the inner corner. The mound also collects tiny particles before they reach the drainage openings. Because the tissue resembles skin, it can grow fine hairs. These functions support cleanliness and comfort.

How Is the Caruncle Examined?

A slit lamp provides a magnified view of texture, glands, and any small cysts. Gentle manipulation assesses tenderness or irritation. When appearance changes, clinicians document size and surface features. These details guide simple care or, rarely, removal.

Why Is the Caruncle Not the Same as the Plica?

The caruncle contains skin derived structures, whereas the plica is a fold of conjunctiva. Each has a distinct makeup and role in the inner corner. Understanding the difference clarifies surface anatomy during exams. It also explains why small hairs may arise from the caruncle but not the plica.

FAQs: Caruncle

Can the caruncle get pimples? Yes, its oil glands can clog like skin elsewhere.

Do hairs here need removal? Usually not; trimming is only for irritation.

Is it part of tear production? It adds to the tear film but does not make bulk aqueous fluid.

References

Rehman, I., Hazhirkarzar, B., & Patel, B. C. (2023). Anatomy, head and neck, eye. StatPearls. National Library of Medicine. https://www.ncbi.nlm.nih.gov/books/NBK482428/

Downie, L. E., Bandlitz, S., Bergmanson, J. P. G., Craig, J. P., Dutta, D., Maldonado-Codina, C., Ngo, W., Siddireddy, J. S., & Wolffsohn, J. S. (2021). CLEAR - Anatomy and physiology of the anterior eye. Contact Lens Evidence-based Academic Report (CLEAR). https://publications.aston.ac.uk/id/eprint/42506/2/CLEAR_Anatomy_Report_2021.pdf

EyeWiki. (2025). Conjunctival epithelial neoplasms (Anatomy section: plica semilunaris and caruncle). EyeWiki. https://eyewiki.org/Conjunctival_Epithelial_Neoplasms

American Academy of Ophthalmology. (2025). Distichiasis (extra eyelashes). EyeWiki. https://eyewiki.org/Distichiasis

WikEM. (2022). Hordeolum. WikEM. https://wikem.org/wiki/Hordeolum