So I underwent a WLE 4.5 years ago for 1A melanoma on the back of my left upper arm. That came back with clear margins and I was discharged from Dermatology 3 years ago after regular 3 month checks. Three months ago I had another couple of mones removed which came back with clear histology, however I had raised calcium levels in my blood, and have had a couple of very low impact fractures this year (I’m age 46) so the dermatologist sent me for a full body and brain scan to be super cautious. A specialist nurse called with the results this week which have shown no metastases but have identified enlarged non-specific axillary lymph nodes in the armpit right by the previous melanoma site. The nurse said that I will have the scan repeated in 2.5 months to check them again. Then I had another call to say the Dermatologist wants a telephone appointment next week. 
I am aware that they could be enlarged due to an infection or virus, (I wasn’t unwell around the time of the scan) but also aware that as it’s only the nodes in my left armpit that are abnormal, it may well be that cancer cells could have drained into these from the previous melanoma. 

Had anyone else had experience of this? If it is cancerous cells what would the next steps be?