Can you please advise what doctor to consult regarding plantar fibromatosis?

Several: Podiatrist, orthopedic surgeon, general surgeon.

Foot specialist: Symptomatic plantar fibroma if unrelieved by unweighting the area with an orthotic or increasing rapidly in a weight bearing area requires surgery. A radical plantar fasciectomy is involved (removing most if not all of the plantar fascia). A skilled surgeon familiar with this procedure should be consulted. Either an orthopedic foot and ankle surgeon (md) or a reputable podiatric surgeon (dpm).