Pictures Of Melanoma Can A Melanoma Spot Come And Go?

Can a melanoma spot come and go? - pictures of melanoma

I went to the doctor today and showed him a large brown / Spot / purple on my arm. I have seen a biopsy on Tuesday, what the hell. My doctor called melanoma, and I did not know how it looks. I looked online for pictures and it looks like melanoma. But this area appears and disappears after a few months. Could it be Melanoma?