Has Anyone Ever Had An Open Soar On The Body, That Has Turned Into Cancer?

And if so then what kind of cancer is this called?
What was the treatment (If caught in time)

I’m asking as, I have a loved one whom this happened to.
Please explain this to me, or is there a good site, that I can read up on.
(If want to open up to this question)- Thank you ever so much.