I was diagnosed with stage IV melanoma in December 2014, a year after I had a cancerous mole removed from my left calf. I thought I was done with it.

Then I felt a lump in my groin while shaving my legs when I was 20 weeks pregnant with my second child. A lymph node biopsy revealed the melanoma was back, but it appeared to be confined to that one area. Not wanting to hurt the baby, I deferred any additional scans or treatment until...