It is composed of bone, cartilage and spindle cells. A small number of people have reported previous trauma.
Bizarre parosteal osteochondromatous proliferation
Palisaded encapsulated neuroma
Terminal osseous dysplasia with pigmentary defects
Progressive osseous heteroplasia
Proliferating epidermoid cyst
Malignant chondroid syringoma
Intradermal spindle cell lipoma
Acral myxoinflammatory fibroblastic sarcoma