Answer by  
                                                                                          Pumpkin1 (201)
                                                            
                          
                          
                                                          Cyst, a tissue infection, blood clots, varicose veins, different kinds of skin cancer, a fracture of a bone, ganglion, scar tissue, a swollen or infected lymph node, a callous formation or a number of other causes. This lump should be checked out by a medical doctor. X-rays, cat scans or a MRI may be required.