THERE IS NO WAY TO DIAGNOSE YOU WITHOUT AN EXAMINATION BY A DOCTOR. What do you mean by a lump? Do you mean
swollen ankles? When you press there with your finger does it leave an indention there? This could be many things from water imbalance, heart problems causing edema, diabetes causing burning in feet, neurological, bone injury. It is impossible to know without testing and examination by a doctor. ONLY A DOCTOR CAN DIAGNOSE YOU.