What Causes Small Raised Lumps In The Foot?

I ve had these small raised bumps on the inner side of my left foot since childhood, however these small raised bumps have become somewhat bigger and have been migrating along the inner side of my left leg as well. I have seen several dermantologist and have received different diagnoses. All I want to know is what it is and how can I get it go away. I have tried a few different steroid creams and topical meds that have seemed to make it worse. It has even been diagnosed as a linear nevea, which could be removed with surgery and leave a long scar. Please help...