Eczema and Leg Swelling: Is There a Connection?

Eczema (atopic dermatitis) is primarily epidermal, but severe, widespread inflammation can contribute to lower extremity edema through several mechanisms:

• Capillary leak: Systemic inflammatory cytokines (IL-6, TNF-α, VEGF) increase vascular permeability → fluid extravasation.
• Lymphatic impairment: Chronic inflammation damages lymphatics → lymphedema component.
• Secondary infection: Cellulitis (common in excoriated eczema) → local edema, erythema, warmth.
• Venous stasis: Pruritus → immobility → dependent edema.
• Comorbidities: Obesity, heart failure, renal/hepatic disease, venous insufficiency—common in severe AD patients.

Clinical Approach

1. Assess bilateral vs. unilateral, pitting vs. non-pitting, skin changes.
2. Rule out cellulitis, DVT, cardiac/renal/hepatic causes.
3. Optimize eczema control: topical corticosteroids/calcineurin inhibitors, wet wraps, systemic agents (dupilumab, JAK inhibitors) if severe.
4. Compression stockings if venous/lymphatic component.
5. Elevate legs, mobility, skin care.

Leg swelling in eczema patients warrants thorough evaluation—don't assume it's "just the eczema."