May Be Caused by

 Common

Bone tumor

Cellulitis

Edema

Filariasis

Heart failure

Hypothyroidism

Lymphangioma

Lymphatic obstruction

Milroy disease

Nephritis

Nephrosis

Osteomyelitis

Primary soft-tissue neoplasm

Spontaneous hemorrhage

Thermal injury

Thyroid acropachy

Trauma

 Uncommon

Acromegaly

Caffey disease

Erythroblastosis fetalis

Fibrodysplasia ossificans progressiva

Melorheostosis

Neurofibromatosis type 1

Reflex sympathetic dystrophy