The image above shows a patient presenting with a painful, localized swelling on the upper eyelid. What is the most likely diagnosis?

Explanation

## Image Findings * A well-demarcated, yellowish, raised lesion is visible on the upper eyelid margin. * The lesion appears pustular or abscess-like. * There is mild surrounding erythema and swelling of the eyelid. ## Diagnosis **Key Point:** The image shows a **hordeolum (stye)**, characterized by an acute, localized, purulent inflammation of the glands of the eyelid margin. A **hordeolum** is an acute bacterial infection, usually staphylococcal, of the sebaceous glands of the eyelid. An **external hordeolum** (stye), as seen in the image, is an infection of the glands of Zeis or Moll, which are located at the eyelid margin. It presents as a painful, red, tender lump that often points to the skin surface, sometimes with a visible yellowish head (pustule) as depicted. An **internal hordeolum** is an infection of a Meibomian gland, located deeper within the tarsal plate. ## Differential Diagnosis | Feature | Hordeolum (Stye) | Chalazion | Blepharitis | Dacryocystitis | | :---------------- | :---------------------------------------------- | :---------------------------------------------- | :---------------------------------------------- | :----------------------------------------------- | | **Location** | Eyelid margin (Zeis/Moll glands) or tarsal plate (Meibomian) | Tarsal plate (Meibomian gland) | Eyelid margins (diffuse) | Medial canthus (lacrimal sac) | | **Onset** | Acute | Chronic | Chronic/Recurrent | Acute/Chronic | | **Pain** | Painful, tender | Painless (usually), non-tender | Itchy, burning, gritty sensation | Painful, tender | | **Appearance** | Red, swollen, localized pustule/abscess | Firm, rubbery, non-tender nodule, deeper | Red, inflamed margins, crusting, scales | Red, swollen lump in medial canthus | | **Pathology** | Acute bacterial infection (Staphylococcus) | Sterile granulomatous inflammation | Chronic inflammation of eyelid margins | Infection of lacrimal sac | ## Clinical Relevance **Clinical Pearl:** Hordeola are typically self-limiting and often resolve with warm compresses and gentle massage, which help to promote drainage. In some cases, topical antibiotics may be prescribed, or incision and drainage may be necessary if conservative measures fail. ## High-Yield for NEET PG **High-Yield:** Differentiate between external and internal hordeolum based on the involved gland: **external hordeolum** involves glands of Zeis or Moll, while **internal hordeolum** involves a Meibomian gland. **Key Point:** The most common causative organism for hordeolum is *Staphylococcus aureus*. ## Common Traps **Warning:** The most common distractor for hordeolum is a chalazion. Remember that a **hordeolum is acute, painful, and infectious**, while a **chalazion is chronic, typically painless, and sterile granulomatous**. ## Reference [cite:Kanski's Clinical Ophthalmology, 9th ed., Ch 4]