I was on it, generic, 150 mg., for about 3 weeks, and it was like a miracle for my UC. Unfortunately, I'm one of those whose liver functions went sky high so the doctor took me off. That was about 2 weeks ago. Most of my blood tests went back to normal but the alk phos is still high.
The doc said they'd try again at a much lower dosage as soon as all my liver levels are normal, and I can't wait. From what I've read, its a much better option than prednisone. Read as much as you can about it, and try not to get caught up in the scarier sounding stuff. Durango Kid is right, the incidence of negative side effects are actually pretty low.
Can you check with a doctor who is familiar with your skin cancer issues? If I understand correctly, you've had surgery for it. The doctor who took care of you would hopefully have some knowledge.
Good luck.