Hi I have had malignant melanoma 10 years ago with multiple mole biopsies, breast cancer with treatment three years ago, uterine cancer with complete hysterectomy two years ago. Since my cancer, I now have high blood pressure treated with medication, hypothyroidism treated with medication and B12 injections. Most recently, I noticed a lump on my lower back/spine area. My doctor said to watch it; she thought it felt spongy and may need to be biopsied if it continues to grow. Should I wait or have it done immediately?