Stye and Chalazion

A 28-year-old woman presents with a painful, red swelling on the upper eyelid margin that has been present for 3 days. She reports tenderness, mild fever (37.8°C), and difficulty opening her eye. On examination, there is localized erythema and edema at the lid margin with a small pustule visible. The conjunctiva is clear and vision is normal. What is the most likely diagnosis?

A 35-year-old man attends the clinic with a painless, slowly enlarging firm nodule on his upper eyelid that has persisted for 8 weeks. He denies fever, discharge, or visual symptoms. On examination, there is a well-defined, non-tender swelling on the lid margin with normal overlying skin and clear conjunctiva. The lesion does not point or drain. What is the most appropriate initial management?

A 28-year-old woman presents with a painful, red swelling on the upper eyelid margin that started 3 days ago. She reports localized tenderness and mild purulent discharge from the lesion. On examination, there is a small pustule at the lid margin with surrounding erythema and edema. The lesion is tender to touch. What is the most likely diagnosis?

A 35-year-old man presents with a painless, firm nodule on the upper eyelid that has been present for 6 weeks. He reports no discharge, redness, or discomfort. On examination, there is a well-defined, non-tender swelling on the tarsal conjunctiva of the upper lid. The overlying skin is normal. He has a history of recurrent similar lesions on the same lid. What is the most likely diagnosis, and what is the pathophysiology?

Which gland is primarily affected in an internal hordeolum (stye)?