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Basal Cell Carcinoma: This is the most common type of eyelid cancer. It usually appears as a small, painless bump or sore that can crust, bleed, or become ulcerated. Basal cell carcinoma is usually slow-growing and rarely metastasizes (spreads to other parts of the body), but early treatment is important to prevent damage to the eye and surrounding tissues. 
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Squamous Cell Carcinoma: Another type of eyelid cancer, squamous cell carcinoma often appears as a scaly, red, and thickened area on the eyelid. It can also become ulcerated or bleed. Like basal cell carcinoma, early treatment is important to prevent complications. 
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Sebaceous Gland Carcinoma: This is a rare but aggressive type of eyelid cancer that originates from the oil-producing glands of the eyelids. It can mimic other benign conditions, making diagnosis challenging. It may cause a lump or nodule that is painless but can cause distortion or loss of eyelashes. 
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Melanoma: Melanoma is a less common but serious type of eyelid cancer that arises from melanocytes, the pigment-producing cells of the skin. Melanoma can appear as a dark-colored lesion or mole on the eyelid. 
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Benign Eyelid Tumors: These include various non-cancerous growths such as chalazion (a blocked oil gland), papilloma (wart-like growth), and nevus (a mole-like lesion). 
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Ultraviolet (UV) Exposure: Prolonged exposure to UV radiation from the sun or tanning beds can increase the risk of developing certain eyelid tumors, particularly basal cell carcinoma and squamous cell carcinoma. 
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Genetics: Genetic factors can play a role in the development of some eyelid tumors, especially conditions that run in families. 
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Age: The risk of eyelid tumors tends to increase with age, particularly for basal cell carcinoma and squamous cell carcinoma. 
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Immunosuppression: Weakened immune systems, often due to conditions like HIV or organ transplantation, can increase the risk of developing certain eyelid tumors. 
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Previous Radiation Exposure: Previous radiation treatment to the eye or nearby areas can increase the risk of developing eyelid tumors. 
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Chronic Inflammation: Chronic inflammation of the eyelids, known as blepharitis, can potentially contribute to the development of certain eyelid tumors.