I was first diagnosed with melanoma in my right lower leg in April 2014. I had my first wide excision. Nuclear dye mapping to lymph nodes, which 6 were taken out behind my knee and 3 in the groin. Later had a skin graft and was laid up all summer waiting for it to heal. Then, 2 weeks before Thanksgiving, I noticed what appeared to be a blood blister next to my incision site. It was a satellite melanoma. I was told I had stage III and had a PET scan, which didn't show any activity anywhere else. Then came another, and then another satellite melanoma. They kept cutting them out and sending me for PET scans that revealed I had a small nodule on my left lung. Too small to biopsy. Now I had a pea size, that grew to marble size in 2 weeks under my skin at the bottom of the original site. Turns out its nodular melanoma and the spot on my lung is now a centimeter. The Dr says I'm in Stage IV now and will biopsy the lung but I will have to start immunotherapy. I'd like to hear from anyone who can give me some insight and advice on what to expect. Or if they know what I can expect from the immunotherapy.