May Be Caused by

 Common

Angiomatous lesion

Benign fibrous histiocytoma

Breast carcinoma metastasis

Dermatofibrosarcoma protuberans

Fibrosarcoma

Kaposi sarcoma

Lipoma

Malignant fibrous histiocytoma

Melanoma metastasis

Metastasis

Myxoma

Nodular fasciitis

 Uncommon

Granuloma annulare

Leiomyosarcoma

Liposarcoma

Lymphoma

Malignant peripheral nerve sheath tumor

Neurofibroma

Schwannoma

Skin appendage tumors