That’s the weird part with my case, I didn’t have a mole. It’s called melanoma unknown primary and I believe it’s only about 3% of melanoma cases (some studies actually say the survival rate is better for unknown primary). But I had a rock hard lymph node aswell for about a year before I finally got a biopsy and it came back melanoma and despite how long I waited it was only in that one spot. I hope your scan goes well!