The characteristic sign of a plantar fibroma is a noticeable lump in the arch of the foot. This bump will feel firm to the touch, and could potentially get bigger as time goes on. Additional fibromas, or alternate diagnoses may develop if preventative or mitigatory action is not taken early.
Pain may or may not be present. Most often, when pain occurs, it is caused by shoes pressing against the mass within the arch. However, it can be painful to walk or stand barefoot, depending on the severity of the fibroma.