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What Is Bowen's Disease (Conjunctival Intraepithelial Neoplasia)?

Bowen's disease of the conjunctiva, also known as conjunctival intraepithelial neoplasia (CIN), is a precancerous condition affecting the surface layer of the eye. It occurs when abnormal cells grow on the conjunctiva or cornea but have not yet invaded deeper tissues. The lesion often appears as a raised, white or pink patch on the eye's surface. If untreated, it can progress to squamous cell carcinoma.

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What Is Bowen's Disease (Conjunctival Intraepithelial Neoplasia)?

Bowen's disease of the conjunctiva, also known as conjunctival intraepithelial neoplasia (CIN), is a precancerous condition affecting the surface layer of the eye. It occurs when abnormal cells grow on the conjunctiva or cornea but have not yet invaded deeper tissues. The lesion often appears as a raised, white or pink patch on the eye's surface. If untreated, it can progress to squamous cell carcinoma.

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What Causes Bowen's Disease of the Conjunctiva?

The condition is most often linked to long-term ultraviolet (UV) exposure. Other contributing factors include human papillomavirus (HPV) infection, exposure to harmful chemicals, and a weakened immune system. People living near the equator or working outdoors are at higher risk. Prior eye surgery or chronic inflammation may also increase susceptibility.

What Are the Symptoms of Bowen's Disease (CIN)?

Symptoms vary depending on the size and location of the lesion. Common signs include a visible growth or patch on the white part of the eye, redness, or mild irritation. Some patients report a foreign-body sensation or slight tearing. In advanced cases, vision may blur if the lesion spreads toward the cornea.

How Is Bowen's Disease Diagnosed?

Diagnosis usually includes:

  • A slit-lamp examination to identify the lesion's size, color, and texture
  • Impression cytology or biopsy to confirm abnormal cell growth
  • High-resolution imaging such as anterior segment OCT to assess tissue involvement
  • Laboratory testing if viral infection or immune deficiency is suspected

How Is Bowen's Disease Treated?

Treatment depends on the lesion's severity and location. Surgical excision with wide margins is often performed to remove abnormal tissue. Cryotherapy or topical chemotherapy agents such as mitomycin C or 5-fluorouracil can help destroy residual cells. Regular follow-up visits are essential to detect recurrence early.

When to Seek Medical Attention

If you notice a persistent red or raised area on the eye surface, schedule an exam. Early diagnosis helps prevent progression to invasive disease. Any changes in size, color, or comfort should be evaluated quickly. People with fair skin or high sun exposure should be especially alert. Regular monitoring supports safer outcomes.

Frequently Asked Questions

Is it cancer or precancer?

It is usually a precancerous change on the eye surface, meaning abnormal cells are present but have not invaded deeper tissue. A biopsy confirms the diagnosis and checks depth. With timely care, treatment can remove or destroy the abnormal cells before invasive cancer develops.

What usually causes it?

Long-term UV exposure is a common risk factor, especially with years of sun exposure. HPV infection and a weakened immune system can also raise risk. Chronic irritation or prior surgery can play a part in some cases. Risk is higher for people who work outdoors or live in high-UV regions.

What symptoms should I watch for?

Many people notice a persistent patch or growth on the white part of the eye that looks white, pink, or slightly raised. Redness, irritation, tearing, or a gritty feeling can happen. Vision can get blurry if the lesion spreads onto the cornea. Any growth that changes in size or color needs an exam.

How is it treated?

Treatment depends on size and location, but surgical removal is common to clear the abnormal tissue. Cryotherapy or medicated eye drops like mitomycin C or 5-fluorouracil can target leftover surface cells. Follow-up visits matter because recurrence can happen. Sun protection helps lower future risk.

References

1. Ocular Surface Squamous Neoplasia. EyeWiki. https://eyewiki.org/Ocular_Surface_Squamous_Neoplasia. Accessed January 16, 2026.

2. Conjunctival Epithelium Neoplasms. EyeWiki. https://eyewiki.org/Conjunctival_Epithelium_Neoplasms. Accessed January 16, 2026.

3. Conjunctival and Corneal Intraepithelial and Invasive Squamous Cell Carcinoma. American Academy of Ophthalmology Journal (full text). https://www.aaojournal.org/article/S0161-6420%2886%2933764-3/fulltext. Accessed January 16, 2026.

4. Conjunctival-corneal intraepithelial neoplasia (Bowen disease). PubMed. https://pubmed.ncbi.nlm.nih.gov/21099419/. Accessed January 16, 2026.

5. Clinical and Pathologic Description of 17 Cases of Corneal Intraepithelial Neoplasia. American Journal of Ophthalmology (abstract). https://www.ajo.com/article/0002-9394%2884%2990371-4/abstract. Accessed January 16, 2026.

6. What Is Bowen's Disease (Conjunctival Intraepithelial Neoplasia)? Lens.com. https://www.lens.com/what-is/bowens-disease-conjunctival-intraepithelial-neoplasia/. Accessed January 16, 2026.