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Differential Diagnosis: Puffiness / Swelling Under the Eye

1. Inflammatory / Infectious Causes (usually erythematous, tender)

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2. Non-inflammatory Causes (soft, non-tender, no erythema)

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3. Traumatic

• Periorbital hematoma ("black eye") — ecchymosis, history of trauma
• Foreign body with secondary inflammation

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Distinguishing Features at a Glance

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Investigations for Puffiness Under the Eye

Step 1 — Clinical Examination First (Before Tests)

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Step 2 — Laboratory Tests

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Step 3 — Imaging

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Step 4 — Special Tests (Targeted)

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Quick Decision Guide

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Clinical Scenario: Bilateral, Non-tender, Persistent Periorbital Puffiness × 2 Days

• Bilateral → systemic cause (not local infection/mass)
• Non-tender, non-erythematous → non-inflammatory
• Worse in morning → fluid redistribution while supine overnight
• Persistent 2 days → beyond simple fatigue/allergy trigger

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Most Likely Diagnoses

🔴 1. Nephrotic Syndrome (Top Priority)

"In the nephrotic patient, edema is often periorbital in the morning — the edema resolves during the day under the influence of gravity." — Comprehensive Clinical Nephrology, 7th Ed.

• Frothy urine (proteinuria)
• Ankle swelling (worsens by evening)
• Decreased urine output
• Abdominal bloating (ascites)
• Fatigue

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🟡 2. Hypothyroidism / Myxedema

"Facial puffiness, periorbital edema, and enlargement of the tongue can occur. This appears as non-pitting cutaneous edema with firm texture and pale waxy appearance." — Tietz Textbook of Laboratory Medicine, 7th Ed.

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🟡 3. Allergic Reaction / Angioedema

• Subacute onset (can persist 2 days), bilateral, non-tender, itchy
• Drug-induced (ACE inhibitors classically), food allergy, idiopathic
• Hereditary angioedema (C1-inhibitor deficiency): recurrent episodes, no urticaria, no itch, does not respond to antihistamines

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🟠 4. Cardiac Failure

• Bilateral periorbital edema is less typical than ankle edema, but can occur in severe cases
• Usually: orthopnea, PND, bilateral leg edema, raised JVP, S3 gallop

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🟠 5. Hepatic Cirrhosis / Hypoalbuminemia

• Periorbital edema from hypoalbuminemia
• Associated: ascites, jaundice, spider naevi, palmar erythema, alcohol history

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🟢 6. Other Considerations (2 days, bilateral)

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Recommended Investigations (Targeted for This Scenario)

Urine

Blood

Imaging

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Most Urgent Next Step

Check urine dipstick for protein first — if 2+ or more, proceed with spot protein:creatinine ratio and serum albumin. This will confirm or exclude nephrotic syndrome rapidly and guide further workup.

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Anatomical Context

Skin → Orbicularis oculi (pretarsal + preseptal) → Orbital septum → Orbital fat (3 compartments) → Tarsal plate

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Revised Differential — Bilateral Skin-Level Swelling Over Lower Orbicularis Oculi × 2 Days, Non-tender

🔴 1. Allergic / Contact Dermatitis

• Contact allergens: Eye drops, cosmetics (mascara, eyeliner, eye shadow), nail polish (transferred by rubbing), face creams, preservatives (benzalkonium chloride)
• Atopic dermatitis: Pre-existing eczema
• Features: Bilateral (cosmetic use is bilateral), fine skin wrinkling, mild erythema possible, +/- itch
• 2 days duration fits a new allergen exposure

🔴 2. Angioedema

• Deep dermal/subdermal oedema of the lower eyelid skin
• Non-pitting, non-tender, no erythema
• Drug-induced (ACEi, NSAIDs), food, idiopathic, or hereditary (C1-INH deficiency)
• Bilateral distribution is classic
• Can persist 24–72 hours per episode

🟡 3. Nephrotic Syndrome

• Hypoalbuminaemia → fluid accumulates in the loose subcutaneous tissue of the lower eyelid preferentially
• Worse in morning (recumbent position equalises fluid)
• The lower orbicularis skin is the earliest and most obvious site in children and young adults
• Associated: frothy urine, periankle oedema by end of day

🟡 4. Dermatomyositis — Heliotrope Sign

"A pink-violet colour, primarily of the eyelids and periorbital skin, which may have associated oedema." — Dermatology, 5th Edition (Bolognini)

• Bilateral periorbital oedema with violaceous (heliotrope) discolouration of the eyelid skin
• Often subtle — can be mistaken for allergic dermatitis
• Ask about: proximal muscle weakness (difficulty climbing stairs, raising arms), Gottron papules on knuckles, V-neck rash on chest

🟡 5. Hypothyroidism (Myxedema)

• Non-pitting, firm, bilateral lower eyelid skin oedema
• Pale, waxy, doughy feel
• Ask about: fatigue, cold intolerance, dry skin, constipation, weight gain, bradycardia

🟠 6. Trichinosis (Trichinella spiralis)

• Classic teaching: bilateral periorbital oedema (lower lid) + fever + myalgia + eosinophilia
• From undercooked meat
• Rare but pathognomonic when present

🟢 7. Renal / Cardiac / Hepatic Oedema

• Less likely to be confined only to the lower eyelid skin without other signs
• Still worth excluding with basic labs

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Key History to Ask NOW

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Focused Investigations

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Bottom Line

1. Allergic contact dermatitis (new cosmetic/eye product — most common in adults)
2. Angioedema (drug/food/idiopathic)
3. Nephrotic syndrome (if frothy urine or other systemic oedema)
4. Dermatomyositis (if subtle violaceous hue — do not miss)