May Be Caused by

 Common

Arteriovenous fistulas

Chronic arthritis

Chronic osteomyelitis

Garré sclerosing osteomyelitis

Hemangioma

Hemihypertrophy

Hyperemia

Idiopathic

Juvenile rheumatoid arthritis

Lymphangioma

Neurofibromatosis

Trauma

Tropical ulcer

Tuberculosis

Tuberculous arthritis

 Uncommon

Caffey disease

Chronic lymphatic obstruction

Congenital macrodactyly

Dysplasia epiphysealis hemimelica

Epidermal nevus syndrome

Fibrous dysplasia

Hemarthrosis

Hemophilia

Infiltrating angiolipoma

Klippel-Trénaunay-Weber syndrome

Macrodystrophia lipomatosa

Maffucci syndrome

Melorheostosis

Neoplasm

Parkes Weber syndrome

Proteus syndrome