Unilateral Leg Swelling should be categorized as Acute vs Chronic. Etiologies are Venous stasis, Lymphedema, trauma or infections.
Lymphedema - Wikipedia
Diagnose on Sight: Chronic Unilateral Lower Extremity Swelling
Unilateral Leg Swelling: Chronic Venous stasis vs Lymphedema
Venous Disease and Lymphedema Management
Differential diagnosis: (from left to right) unilateral lymphedema
Lymphedema and Chronic Vein Insufficiency: What's The Difference?
Learn About Lymphedema Center for Vein Restoration
Long-standing lipedema complicated by both chronic venous insufficiency
316 Lower Extremity Edema with The Curbsiders - The Curbsiders
Can venous insufficiency appear outside the legs, such as the arms, face, and abdomen? Is there a medical term for this outside of CVI? - Quora
Unilateral Leg Swelling: Chronic Venous stasis vs Lymphedema
Table 3 from Approach to leg edema of unclear etiology.
Stasis Pigmentation: Treatment is Limited. Buyer Beware!