What type of fibromatosis grows on top of the foot?

Possible desmoid?: Most fibromatoses of the foot occurs on the bottom (plantar) surface. There is a type of benign tumor that is very invasive called a desmoid fibromatosis or desmoid tumor. I would be concerned that a lump on the top (dorsal) surface of the foot could be this, which is aggressive. A ganglion cyst is another possibility. See a doctor for possible imaging and biopsy.

None: Most fibromas of the foot occur on the bottom. You may be seeing a ganglion.