It is a scary thing to even think about. Hopefully, it is not Melanoma but IF it is the biopsy will help identify possible treatment options. I was 1b in 2016 on my thigh. Swollen lymphnode in groin in 1/22 biopsy confirmed melanoma. If you contain a BRAF mutation your treatment might include targeted therapy. There is research indicating targeted therapy prior to node dissection increases chances of overall survival. I started targeted therapy in Jan and had my lymphnode dissection in August after the lymphode had considerable shrinkage. Hope tomorrow goes well and you get speedy results. Will be thinking of you.